Wang, Yu, et al. “Seasonal Expressions of Androgen Receptor, Estrogen Receptors and Cytochrome P450 Aromatase in the Uteri of the Wild Daurian Ground Squirrels (Spermophilus Dauricus)”. European Journal of Histochemistry, vol. 62, no. 1, Feb. 2018, doi:10.4081/ejh.2018.2889.