Requested reference
Eskov, K. Y. (1987b). The spider genus Robertus O. Pickard-Cambridge in the USSR, with an analysis of its distribution (Arachnida: Araneae: Theridiidae). Senckenbergiana Biologica 67: 279-296. 
-- Show included taxa
Eskov, K. Y. (1987b). The spider genus Robertus O. Pickard-Cambridge in the USSR, with an analysis of its distribution (Arachnida: Araneae: Theridiidae). Senckenbergiana Biologica 67: 279-296. -- Show included taxa