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4. [Is a unified concept of species in ornithology possible? (An opinion of a practicing taxonomist)]. Nazarenko AA Zh Obshch Biol; 2001; 62(2):180-6. PubMed ID: 11544775 [TBL] [Abstract][Full Text] [Related]
5. [Sibling species and some problems of their study with respect to ornithology]. Stepanian LS Zh Obshch Biol; 1966; 27(2):233-43. PubMed ID: 6004427 [No Abstract] [Full Text] [Related]
6. SOME RECENT ECONOMIC AND SCIENTIFIC QUESTIONS IN ORNITHOLOGY.*. Shufeldt RW Science; 1893 Nov; 22(562):255-6. PubMed ID: 17836817 [No Abstract] [Full Text] [Related]
7. BIRD COLLECTING AND ORNITHOLOGY. van Name WG Science; 1915 Jun; 41(1066):823-5. PubMed ID: 17835985 [No Abstract] [Full Text] [Related]