Reakcija za ranna bremennost s Rana esculenta ridibunda i s Rana temporaria, agilis, graeca i Bufo viridis = Early pregnancy diagnosis test with Rana esculenta ridibunda, and with Rana temporaria, agilis, graeca and Bufo viridis - Bratanov, Penčo P. (Dăržavna Industrialna Pečatnica "Stopansko Razvitie", 1949)
In kyrill. Schr., bulg. - Zsfassung in engl. Sprache. - Aus: Bălgarska klinika ; 20