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Transportation Urban Studies Urology Veterinary (miscellaneous) Virology Visual Arts and Performing Arts Waste Management and Disposal Water Science and Technology All regions Africa Asiatic Region Eastern Europe Latin America Middle East Northern America Pacific Region Western Europe ARAB COUNTRIES BRIICS EU-28 IBEROAMERICA LANIC NORDIC COUNTRIES OECD 1996-2021 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 Display countries with at least Documents Citable documents Cites Apply Download data Country Documents Citable documents Citations Self-Citations Citations per Document H index 1 United States 14408686 12662685 422381431 181255974 29.31 2711 2 China 8254736 8081358 96129346 55619277 11.65 1112 3 United Kingdom 4235739 3564646 114382158 24729307 27.00 1707 4 Germany 3663812 3352795 89183196 20651732 24.34 1498 5 Japan 3191326 3035507 58822810 14431511 18.43 1171 6 France 2521133 2325263 61010667 11895280 24.20 1352 7 India 2353482 2177268 26332969 8967838 11.19 745 8 Italy 2197985 1983062 48803041 11022920 22.20 1189 9 Canada 2146402 1917712 58975462 9677796 27.48 1381 10 Australia 1747456 1538304 43564203 8366775 24.93 1193 11 Spain 1731575 1586734 36528228 7602845 21.10 1073 12 Russian Federation 1472666 1432179 12197559 4154321 8.28 675 13 South Korea 1400127 1350774 23272197 4247883 16.62 810 14 Brazil 1233706 1165637 16948185 5324097 13.74 690 15 Netherlands 1190268 1067013 38427592 5379405 32.28 1206 16 Switzerland 882183 799411 29253552 3452521 33.16 1142 17 Poland 836384 795462 10664792 2509279 12.75 660 18 Sweden 807075 738825 24290014 3240787 30.10 1036 19 Taiwan 789909 758084 13233047 2209341 16.75 615 20 Turkey 767299 713081 9710816 2000813 12.66 535 21 Iran 733080 707897 8788390 2872308 11.99 416 22 Belgium 654135 594668 18426687 2153144 28.17 942 23 Denmark 497068 449661 15613319 1927898 31.41 900 24 Austria 486188 440891 12212730 1410769 25.12 783 25 Israel 457975 415893 12680144 1493196 27.69 821 26 Mexico 416112 388769 6004537 1121192 14.43 536 27 Czech Republic 412910 394789 5890602 1143483 14.27 554 28 Finland 411751 380093 11234329 1467156 27.28 756 29 Malaysia 410009 391970 4465995 1007984 10.89 415 30 Portugal 405434 370547 7710506 1226258 19.02 599 31 Norway 400814 359077 10278860 1371037 25.64 747 32 Hong Kong 392606 362445 10170103 1111792 25.90 687 33 Greece 390754 352361 8043851 1080931 20.59 610 34 Singapore 373202 341165 9580943 930752 25.67 697 35 South Africa 372646 336951 6268457 1247517 16.82 567 36 Egypt 302626 290713 3812756 786275 12.60 349 37 New Zealand 301756 265890 7413693 933091 24.57 633 38 Saudi Arabia 299283 285929 4487881 712683 15.00 478 39 Ireland 264124 231551 6448205 628096 24.41 628 40 Indonesia 263491 256614 1393314 377132 5.29 284 41 Argentina 260997 243496 4704091 861118 18.02 510 42 Romania 255651 244577 2492998 493756 9.75 364 43 Ukraine 250206 243638 1933272 544015 7.73 323 44 Thailand 248087 235095 3447129 522983 13.89 396 45 Pakistan 244476 232874 2798976 679622 11.45 353 46 Hungary 235457 220928 4463516 610303 18.96 540 47 Chile 203622 191964 3555884 639491 17.46 451 48 Colombia 150096 141076 1794712 273154 11.96 356 49 Slovakia 141920 136388 1741765 304134 12.27 331 50 Nigeria 135504 127434 1298563 265966 9.58 260 51 Croatia 132764 125767 1607219 253870 12.11 337 52 Serbia 120688 113652 1490196 244689 12.35 307 53 Slovenia 119016 112235 2046971 279693 17.20 361 54 Tunisia 113626 107531 1245991 225365 10.97 235 55 Viet Nam 101068 96177 1233938 205683 12.21 269 56 Bulgaria 99709 95103 1306680 171079 13.10 305 57 Algeria 93727 90863 896338 178117 9.56 213 58 Morocco 93468 88034 946325 185488 10.12 232 59 United Arab Emirates 87125 80662 1075950 109871 12.35 268 60 Iraq 79792 77910 455521 105670 5.71 155 61 Bangladesh 79426 74897 970199 170255 12.22 252 62 Lithuania 67285 64629 878242 139107 13.05 265 63 Jordan 60967 58789 738525 90396 12.11 219 64 Estonia 53313 49547 1241149 151551 23.28 346 65 Philippines 51529 47327 834694 81072 16.20 296 66 Kenya 49757 44630 1128835 148443 22.69 310 67 Belarus 47179 45986 534268 93090 11.32 213 68 Cuba 47064 44406 458316 74348 9.74 200 69 Lebanon 45782 41600 745429 62343 16.28 264 70 Venezuela 45565 43161 677763 65258 14.87 254 71 Peru 43570 39588 692903 74586 15.90 288 72 Ethiopia 43527 41204 586699 131131 13.48 193 73 Qatar 42526 39137 698753 67249 16.43 238 74 Kazakhstan 41193 39708 257366 47506 6.25 138 75 Cyprus 39026 35054 716136 70369 18.35 254 76 Ecuador 36638 34701 418499 56830 11.42 197 77 Ghana 34018 31360 516955 69123 15.20 191 78 Latvia 33495 32056 421258 51357 12.58 202 79 Kuwait 32882 31092 460773 41447 14.01 195 80 Sri Lanka 30366 27913 487080 42909 16.04 225 81 Oman 28405 26003 366998 35319 12.92 176 82 Iceland 28130 25145 1010862 78217 35.94 370 83 Luxembourg 28094 25265 596099 43279 21.22 243 84 Uruguay 25948 24058 516818 56216 19.92 222 85 Georgia 25654 23194 500181 53000 19.50 219 86 Uganda 25278 22955 541244 74784 21.41 209 87 Macao 25149 23663 389743 35787 15.50 178 88 Tanzania 24827 22851 522933 68413 21.06 205 89 Nepal 23655 21322 345676 41962 14.61 175 90 Cameroon 23253 21766 379695 61161 16.33 167 91 Armenia 21101 20294 401257 66930 19.02 214 92 Puerto Rico 20119 18870 540256 25517 26.85 253 93 Uzbekistan 19574 19099 129409 29081 6.61 106 94 Azerbaijan 19170 18595 194717 34488 10.16 138 95 Bosnia and Herzegovina 18020 16698 162213 14731 9.00 128 96 Costa Rica 17704 16366 401757 34787 22.69 214 97 Macedonia 15176 14274 209167 15438 13.78 152 98 Zimbabwe 14595 13017 251955 26092 17.26 164 99 Senegal 13510 12495 196890 19871 14.57 146 100 Sudan 13309 12464 181733 14717 13.65 119 101 Malta 11424 9730 209137 13317 18.31 165 102 Palestine 10971 10322 190215 15810 17.34 131 103 Malawi 10758 9706 234205 26542 21.77 166 104 Bahrain 10751 9793 147546 6812 13.72 117 105 Botswana 10411 9268 161915 14356 15.55 127 106 Syrian Arab Republic 9942 9398 148718 11427 14.96 130 107 Panama 9810 9059 405770 30041 41.36 242 108 Moldova 9694 9254 146799 16295 15.14 135 109 Burkina Faso 9037 8562 154752 19998 17.12 126 110 Zambia 8814 7876 202453 17100 22.97 151 111 Côte d’Ivoire 8664 8174 154129 11683 17.79 134 112 Trinidad and Tobago 8325 7365 115333 7367 13.85 117 113 Jamaica 8206 6984 145919 9778 17.78 121 114 Libya 8152 7782 99791 4160 12.24 94 115 Yemen 7891 7562 108665 10291 13.77 98 116 Benin 7770 7384 159520 15227 20.53 117 117 Mongolia 7115 6677 104903 11670 14.74 117 118 Albania 6975 6460 66152 5067 9.48 85 119 Brunei Darussalam 6683 5861 90226 7974 13.50 105 120 Bolivia 6365 5858 170690 10254 26.82 151 121 Congo 6268 5755 137493 8593 21.94 133 122 Montenegro 6120 5758 57948 8594 9.47 80 123 Mozambique 5964 5425 161893 11182 27.15 130 124 Madagascar 5820 5489 100776 14602 17.32 113 125 Cambodia 5815 5228 118637 12533 20.40 128 126 Myanmar 5767 5269 84301 6503 14.62 95 127 Rwanda 5533 4948 113241 7386 20.47 107 128 Namibia 5472 4849 98074 7602 17.92 119 129 Fiji 5448 4799 106707 7460 19.59 109 130 Mauritius 4975 4449 71251 6251 14.32 104 131 Mali 4675 4356 103123 7937 22.06 124 132 Guatemala 4551 4134 87136 5294 19.15 110 133 Kyrgyzstan 4132 3767 101706 4140 24.61 103 134 Papua New Guinea 3907 3609 92047 6800 23.56 112 135 Paraguay 3769 3459 65678 3716 17.43 103 136 Laos 3763 3441 69986 7671 18.60 107 137 Gabon 3463 3235 83800 7471 24.20 120 138 Gambia 3396 3130 150028 8557 44.18 145 139 New Caledonia 3343 3144 122063 9489 36.51 123 140 Monaco 3001 2696 97249 6661 32.41 126 141 Niger 2939 2736 56580 4187 19.25 96 142 Togo 2856 2650 41900 2191 14.67 63 143 Barbados 2802 2327 82986 2432 29.62 102 144 Dominican Republic 2777 2583 37986 2001 13.68 81 145 Afghanistan 2674 2346 64658 1950 24.18 69 146 Tajikistan 2642 2545 19225 2696 7.28 58 147 Democratic Republic Congo 2538 2334 40747 1722 16.05 78 148 Honduras 2476 2271 38867 1658 15.70 76 149 Grenada 2438 2108 27664 1376 11.35 63 150 Nicaragua 2252 2077 49498 2883 21.98 100 151 French Polynesia 2247 2089 58799 5155 26.17 99 152 Liechtenstein 2231 2007 49290 3310 22.09 103 153 El Salvador 2010 1829 34526 1553 17.18 77 154 Swaziland 1986 1837 28336 1274 14.27 73 155 Guadeloupe 1898 1757 35941 1723 18.94 79 156 Sierra Leone 1864 1646 38851 3240 20.84 73 157 Greenland 1832 1716 52235 4982 28.51 87 158 French Guiana 1698 1551 44793 2638 26.38 92 159 Angola 1648 1525 23791 1738 14.44 56 160 Bhutan 1599 1418 27500 1874 17.20 61 161 Haïti 1592 1409 31961 2823 20.08 76 162 North Korea 1555 1530 11336 1314 7.29 43 163 Guinea 1484 1363 31348 1769 21.12 78 164 Guam 1191 1077 24195 995 20.31 75 165 Faroe Islands 1138 1033 26401 2136 23.20 72 166 Bermuda 1049 949 48026 2405 45.78 105 167 Saint Kitts and Nevis 1045 858 11165 634 10.68 46 168 Martinique 1034 925 31953 411 30.90 59 169 Lesotho 1025 942 11699 565 11.41 46 170 Burundi 1007 933 19818 640 19.68 55 171 Central African Republic 985 915 17742 920 18.01 60 172 Reunion 968 890 17352 257 17.93 62 173 Mauritania 964 907 12110 858 12.56 50 174 Seychelles 941 870 35591 1659 37.82 74 175 Bahamas 941 844 15156 1181 16.11 61 176 Guyana 918 818 13249 455 14.43 56 177 Liberia 917 773 27821 1077 30.34 63 178 Eritrea 862 802 13450 725 15.60 53 179 Guinea-Bissau 846 768 20889 4114 24.69 68 180 Chad 799 754 14171 993 17.74 49 181 Solomon Islands 694 646 15174 943 21.86 51 182 Suriname 692 627 13817 660 19.97 49 183 Belize 660 574 29164 471 44.19 58 184 Vanuatu 607 564 9294 872 15.31 45 185 Samoa 596 543 8596 505 14.42 42 186 Maldives 554 509 7182 595 12.96 40 187 Cape Verde 533 510 6374 498 11.96 38 188 Falkland Islands (Malvinas) 532 496 10619 1191 19.96 48 189 Somalia 531 468 5188 218 9.77 28 190 San Marino 492 437 30901 384 62.81 49 191 Dominica 481 426 7546 191 15.69 44 192 Netherlands Antilles 444 401 19022 218 42.84 60 193 Turkmenistan 425 406 5136 526 12.08 32 194 Cayman Islands 404 366 5930 167 14.68 39 195 Djibouti 394 377 3985 315 10.11 31 196 Timor-Leste 392 346 3770 305 9.62 30 197 Federated States of Micronesia 376 322 44616 460 118.66 57 198 Andorra 344 310 6079 169 17.67 36 199 Palau 312 294 6096 448 19.54 44 200 Equatorial Guinea 287 270 7246 445 25.25 33 201 Virgin Islands (U.S.) 279 265 7833 110 28.08 39 202 Tonga 263 246 9879 199 37.56 34 203 Antigua and Barbuda 258 234 2209 58 8.56 25 204 Republic of South Sudan 244 220 1370 75 5.61 20 205 American Samoa 239 224 4937 181 20.66 31 206 Gibraltar 237 199 5981 242 25.24 37 207 Aruba 234 170 2659 33 11.36 22 208 Comoros 218 201 2860 178 13.12 24 209 Saint Lucia 202 168 7961 36 39.41 30 210 Saint Vincent and the Grenadines 202 183 2254 20 11.16 24 211 Virgin Islands (British) 176 155 5136 79 29.18 33 212 Marshall Islands 152 131 2463 59 16.20 27 213 Montserrat 138 133 4331 312 31.38 34 214 Anguilla 131 100 26376 146 201.34 34 215 Northern Mariana Islands 120 112 1638 52 13.65 22 216 Cook Islands 118 109 3007 114 25.48 28 217 Mayotte 118 113 965 36 8.18 14 218 Kiribati 108 100 1097 34 10.16 17 219 Sao Tome and Principe 106 100 1657 105 15.63 23 220 Turks and Caicos Islands 89 84 1493 60 16.78 22 221 Curaçao 84 72 232 11 2.76 8 222 Vatican City State 79 47 736 13 9.32 16 223 Svalbard and Jan Mayen 62 57 758 3 12.23 14 224 Saint Helena 60 57 591 14 9.85 13 225 Tuvalu 44 39 948 8 21.55 13 226 Nauru 34 30 456 9 13.41 11 227 British Indian Ocean Territory 34 30 523 0 15.38 11 228 Niue 27 23 697 3 25.81 9 229 United States Minor Outlying Islands 24 22 906 0 37.75 12 230 Norfolk Island 24 19 258 0 10.75 10 231 Wallis and Futuna 22 19 143 5 6.50 7 232 South Georgia and the South Sandwich Islands 22 19 94 0 4.27 5 233 Cocos (Keeling) Islands 14 14 247 0 17.64 6 234 Tokelau 10 9 607 1 60.70 4 235 Western Sahara 10 7 67 0 6.70 5 236 Sint Maarten 9 8 4 0 0.44 1 237 Christmas Island 7 7 73 0 10.43 4 238 Saint Pierre and Miquelon 7 6 20 0 2.86 3 239 Bouvet Island 7 6 46 0 6.57 3 240 French Southern Territories 6 6 172 0 28.67 5 241 Pitcairn 3 1 20 0 6.67 2 242 Heard Island and McDonald Islands 2 2 12 0 6.00 1 Metrics based on 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