1. Programme d'analyse des troupeaux porcins,1990
2. Questionnaire de Personnalité en Seize Facteurs;Chévrier,1987
3. Effects of farrowing crate floors on health and performance of piglets and sows;Christison;Vet. Rec.,1987
4. Variation in the national swine farm: comparisons of productivity and health measurements for 712 national animal health monitoring swine farms;Cowen,1992