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Merkwitz, C.; Blaschuk, O.; Eplinius, F.; Winkler, J.; Pro mel, S.; Schulz, A.; Ricken, A. . (2015). A simple method for inducing estrous cycle stage-specific morphological changes in the vaginal epithelium of immature female mice. Laboratory Animals, (), 0023677215617387–. doi:10.1177/0023677215617387 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research