1. ANAFI, 1994. Page 46 in Delibere Commissione Tecnica Centrale 1981-1994. Cremona, Italy.
2. ANAFI, 2000. Herd-book statistics genetic improvement Cremona, Italy.
3. BANOS, G., SIGURDSSON, A., 1996. Application of contemporary methods for the use of international data in national genetic evaluations. J. Dairy Sci. 79:1117–1125.
4. BONAITI, B., BOICHARD, D., BARBAT, A., MATTALIA, S., 1993. Problems arising with genetic trend estimation in dairy cattle. pp 65–72 in Proc. Open Session Interbull Annual Meeting, Bulletin N. 8, Aarhus, Denmark.
5. CASSANDRO, M., CARNIER,P., BITTANTE, G., 1999. Effect of heterogeneous sire variance between imported and national Holstein Friesian bulls on predicted breeding values for protein yield. pp 173–177 in Recent progress in animal production science. 1. Proc. 13thNat. Congr. A.S.P.A., Piacenza, Italy.