Cumulus oophorus mucification during resumption of meiosis in the pig. A scanning electron microscope study J.-E. FLÉCHON, J. MOTLIK, R. H. F. HUNTER, Bernadette FLÉCHON, J. PIVKO and J. FULKA Reprod. Nutr. Dévelop., 26 4 (1986) 989-998 DOI: 10.1051/rnd:19860606