Papaevangelou, E., & Kyriakopoulou-Sklavounou, P. (?????.).  (2007).  COMPARATIVE MORPHOLOGICAL AND HISTOLOGICAL STUDY OF NUPTIAL PADS OF THE WATERFROGS Rana epeirotica AND Rana ridibunda WITH SCANNING ELECTRON MICROSCOPE AND OPTICAL MICROSCOPE. ??? ???????? ???????? ?????????? ????????? - 29° ?????? ????????. ????????????? ??? 17? ? 19? ?????, ??????: ???????? ???????? ?????????? ????????? .