1. Estima de los componentes de varianza con dos modelos diferentes en dos poblaciones de ganado Frisón en España;Ben Gara;ITEA,1991
2. L'analyse des données. 2. Ĺanalyse des correspondances;Benzecri J.P. et Collaborateurs,1982
3. Adjustment for heterogeneity of variances by herd production level in dairy cow and sire evaluation;Boldman;J. Dairy Sci.,1990
4. Heterogeneity of variance amongst herds for milk production;Brotherstone;Anim. Prod.,1986
5. Maximum likelihood from incomplete data via the EM algorithm;Dempster;J. Royal Stat. Soc. B.,1977