Ultracytochemical localization of Na+, K+-activated ATPase in the oocytes of Heterandria formosa Agassiz, 1853 (Pisces, Poeciliidae) R. RIEHLReprod. Nutr. Dévelop., 20 1A (1980) 191-196DOI: https://doi.org/10.1051/rnd:19800113