00273nam a2200097 a 450000500170000008200210001710000230003824500580006126000340011930000220015320251203091013.0  a599.032,bD, gur  aGuraya, Sardul, S.  aBiology of spermatogenesis and spermatozoa in mammals  aBerlinbSpringer-Verlagc1987  axvi, 430p, 22 cm.