Sofianidou, T. S., Schneider, H., & Asimakopoulos, B. (?????.).  (1987).  Distribution of the water frog Rana epeirotica (Amphibia, Anura) in Greece..  (J. J.  van Gelder, Strijbosch, H., & Bergers, D. J. M., ????.)4th Ordinary General Meeting of the Societas Europaea Herpetologica. ????????????? ??? 1987, Nijmegen: Societas Europaea Herpetologica, Faculty of Sciences.

Schneider, H., & Sofianidou, T. S. (?????.).  (1987).  Hybrid types of water frogs living sympatrically with Rana epeirotica and Rana ridibunda in Greece..  (J. J.  van Gelder, Strijbosch, H., & Bergers, D. J. M., ????.)4th Ordinary General Meeting of the Societas Europaea Herpetologica. ????????????? ??? 1987, Nijmegen: Societas Europaea Herpetologica, Faculty of Sciences.

Klewen, R., Franzen, M., & Winter, H. G. (?????.).  (1987).  Distribution and ecology of Mertensiella luschani (Steindachner, 1891)..  (J. J.  van Gelder, Strijbosch, H., & Bergers, D. J. M., ????.)4th Ordinary General Meeting of the Societas Europaea Herpetologica.. ????????????? ??? 1987., Nijmegan.: Societas Europaea Herpetologica, Faculty of Sciences.