Requested reference
Drensky, P. (1931). Paiatzi ot pescherite na Beulgaria. Spisanié na Beulgarskata Akademia na Naoukite 44: 1-50. 
-- Show included taxa
Drensky, P. (1931). Paiatzi ot pescherite na Beulgaria. Spisanié na Beulgarskata Akademia na Naoukite 44: 1-50. -- Show included taxa