1. International Code of Zoological Nomenclature, 4th edn;ICZN;ITZN London,1999
2. Individual organisms as terminal entities: laying the species problem to rest;Vrana;Cladistics,1992
3. The biological species concept;Mayr,2000
4. The Hennigian species concept;Meier,2000
5. The phylogenetic species concept (sensu mishler and theriot): monophyly, apomorphy, and phylogenetic species concept;Mishler,2000