Tóth, Tamás, et al. “Results of Repeated Ultrasound Measurements of Four Teat Parameters in Holstein-Friesian Breed”. Animal Welfare, Ethology and Housing Systems (AWETH), vol. 13, no. 1, May 2017, pp. 31-38, https://doi.org/10.17205/SZIE.AWETH.2017.1.031.