Silvano, A., S. Nistri, L. Calosi, and P. Romagnoli. “Effect of Cigarette Smoke and Treatment With Relaxin on Guinea Pig Skin”. Italian Journal of Anatomy and Embryology, vol. 124, no. 1, May 2019, pp. 42-57, https://oajournals.fupress.net/index.php/ijae/article/view/1696.