| New feather mite species (Acarina: Analgoidea) from some starlings (Passeriformes: Sturnidae) of South Africa. SV Mironov, G Kopij | 43 | 1996 |
| Stomach content and grit ingestion by Rook Corvus frugilegus nestlings G Orlowski, Z Ksasprzykowski, Z Zawada, G Kopij Ornis Fennica 86 (4), 117–122-117–122, 2009 | 38 | 2009 |
| The structure of assemblages and dietary relationships in birds of South African grasslands G Kopij Wydawnictwo Akademii Rolniczej, 2006 | 35 | 2006 |
| Birds of Roma Valley, Lesotho G Kopij Department of Biology, National University of Lesotho, 2001 | 33 | 2001 |
| Atlas of birds of Bloemfontein G Kopij Department of Biology, National University of Lesotho, 2001 | 33 | 2001 |
| Birds of Maseru G Kopij NUL Journal of Research 8, 104-151, 2000 | 33 | 2000 |
| Diet of swifts (Apodidae) and swallows (Hirundinidae) during the breeding season in South African grassland G Kopij Acta ornithologica 35 (2), 203-206, 2000 | 30 | 2000 |
| Food of the Lesser Kestrel (Falco naumanni) in its winter quarters in South Africa G Kopij Journal of Raptor Research 36 (2), 12, 2002 | 29 | 2002 |
| Avian diversity in an urbanized South African grassland G Kopij Zoology and Ecology 25 (2), 87-100, 2015 | 27 | 2015 |
| Birds of Katima Mulilo town, Zambezi Region, Namibia G Kopij University of Namibia, 2016 | 26 | 2016 |
| Breeding ecology of the Sacred Ibis Threskiornis aethiopicus in the Free State, South Africa G Kopij South African Journal of Wildlife Research-24-month delayed open access 29 …, 1999 | 26 | 1999 |
| Three new species of the feather mite family Proctophyllodidae (Acarina: Analgoidea) from some South African passerine birds (Aves: Passeriformes). SV Mironov, G Kopij | 26 | 1996 |
| New feather mites species of the genus Trouessartia (Acari: Analgoidea: Trouessartiidae) from South African passerines (Aves: Passeriformes) SV Mironov, G Kopij Mitteilungen aus dem Hamburgischen Museum and Institut 97, 99-115, 2000 | 25 | 2000 |
| Helminth fauna of sympatric Przewalski’s Equus przewalskii Poljakov, 1881 and domestic horses E. caballus L. in the Chernobyl exclusion zone, Ukraine K Slivinska, G Dvojnos, G Kopij Helminthologia 43, 27-32, 2006 | 24 | 2006 |
| Ptaki legowe Wielkiej Wyspy Szczytnickiego Zespolu Przyrodniczo-Krajobrazowego we Wroclawiu G Kopij Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Zootechnika 50, 187-204, 2004 | 24 | 2004 |
| Lepidoptera fauna of Lesotho G Kopij Acta Zoologica Cracoviensia-Series B: Invertebrata 49 (1-2), 137-180, 2006 | 23 | 2006 |
| Taxonomic diversity and spatio-temporal distribution of late Cenozoic beavers (Castoridae, Rodentia) of Ukraine L Rekovets, G Kopij, D Nowakowski Acta Zoologica Cracoviensia-Series A: Vertebrata 52 (1-2), 95-105, 2009 | 22 | 2009 |
| Awifauna legowa Plaskowyzu Glubczyckiego G Kopij Chrońmy Przyrodę Ojczystą 55 (2), 34-51, 1999 | 22 | 1999 |
| Timing of colony occupation, clutch size and breeding success in the Cattle Egret Bubulcus ibis related to nest location in a South African heronry G Kopij Acta Ornithologica 2 (32), 169-174, 1997 | 20 | 1997 |
| Daily activity patterns of ungulates at water holes during the dry season in the Waterberg National Park, Namibia E Kasiringua, G Kopij, Ș Procheș Russian Journal of Theriology 16 (2), 129-138, 2017 | 19 | 2017 |
