Lenner, Ádám, et al. “Changes in the Relationship Between Hungarian Grey Cows (Bos Primigenius Taurus Hungaricus) and Their Calves in the Period from Calving to Four Months of Age”. Acta Agraria Debreceniensis, no. 1, May 2022, pp. 85-90, https://doi.org/10.34101/actaagrar/1/10421.