Research of some physical and mechanical characteristics of cow’s udder nipplesVladimir Khripin, Vyacheslav Ulyanov, Alexander Kiryanov, Ekaterina Kurochkina and Lyudmila CherkashinaE3S Web Conf., 175 (2020) 03005DOI: https://doi.org/10.1051/e3sconf/202017503005