ULTRASTRUCTURAL OBSERVATIONS ON THE FORMATION AND DEVELOPMENT OF PRONUCLEI IN POLYSPERMIC PIG EGGS D. SZÖLLÖSI and R. H. F. HUNTERAnn. Biol. anim. Bioch. Biophys., 16 2 (1976) 160DOI: https://doi.org/10.1051/rnd:19760207