Dono, G., L. Giraldo, and E. Nazzaro. 2013. “Contribution of the Calving Interval to Dairy Farm Profitability: Results of a Cluster Analysis of FADN Data for a Major Milk Production Area in Southern Italy”. Spanish Journal of Agricultural Research 11 (4), 857-68. https://doi.org/10.5424/sjar/2013114-3873.