Template:Doweld, 1999c
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- Doweld, A.B. 1999. Конспект филогенетической системы трибы Cacteae (Cactoideae – Cactaceae). II. Система подтриб Pediocactinae – Thelocactinae – Coryphanthinae [An outline of the phylogenetic system of classification of the tribe Cacteae (Cactoideae – Cactaceae). II. System of the subtribes Pediocactinae – Thelocactinae – Coryphanthinae]. Sukkulenty 1999(2): 4–18. (Russian)