Penasa, Mauro, Riccardo Dal Zotto, Martino De Marchi, G. De Jong, L. Gallo, P. Carnier, Massimo Cassandro, and G. Bittante. 2006. “Analysis on Crossbreeding in the Dutch Dairy Cattle Population”. Acta Agraria Kaposváriensis 10 (2): 93-98. https://journal.uni-mate.hu/index.php/aak/article/view/1781.