Variations of intestinal calcium absorption in adult frogs (Rana esculenta). Effect of lysine Hakima EL MARAGHI-ATER, J. HOURDRY, Jacqueline MESNARD and Yvonne DUPUIS Reprod. Nutr. Dévelop., 27 2A (1987) 407-412 DOI: 10.1051/rnd:19870303