1. The superspecies concept;Amadon;Syst. Zool.,1966
2. Experimental model of the origin of bisexual polyploid species in animals (the hypothesis of indirect origin of polyploid animals via parthenogenesis and hybridization);Astaurov;Biol. Zentralbl.,1972
3. Hybrid zones and reproductive isolation;Bigelow;Evolution,1965
4. Merkmale und Artabgrenzung: Die Vorrangigkeit evolutionstheoretischer und biologisch-ökologischer Erklärung in der Taxonomie;Bonik;Natur u. Mus.,1978
5. Call types of the Rana pipiens complex in Illinois;Brown;Science,1972