Correia S, Oliveira PF, Guerreiro PM, et al. Sperm parameters and epididymis function in transgenic rats overexpressing the Ca2+-binding protein regucalcin: a hidden role for Ca2+ in sperm maturation?. Mol Hum Reprod. 2013;19(9):581-9. doi:10.1093/molehr/gat030

Fuentes J, Haond C, Guerreiro PM, Silva N, Power DM, Canario AVM. Regulation of calcium balance in the sturgeon Acipenser naccarii: a role for PTHrP. Am J Physiol Regul Integr Comp Physiol. 2007;293(2):R884-93. doi:10.1152/ajpregu.00203.2007