Y. Hidalgo V., C. Velásquez V., N. Chagray A., N. Llapapasca G., and A. Delgado C., “Relationship between two methods of heat detection and reproductive efficiency in Holstein cows”, Rev. investig. vet. Perú, vol. 29, no. 4, pp. 1364–1371, Nov. 2018, doi: 10.15381/rivep.v29i4.15388.