Influence of copulatory stimuli on uterine motility to transport the sperm into uterus of the rat. Pt. I. Effect of copulation on eliciting pseudopregnancy and uterine motility Ogawa, S. Jap. J. Anim. Reprod, 4: Pt. I, 127-129 1958 https://eurekamag.com/research/014/079/014079264.php