1. Effects of age and stage of lactation on type classification;Hansen;J. Dairy Sci.,1969
2. Effect of various discrete distributions on the magnitude of heritability;Hillere;J. Dairy Sci.,1972
3. Holstein-Friesian Association of America. 1971. Descriptive type classification – the official herd classification program for registered Holsteins. Brattleboro, Vermont.
4. Components of variance for descriptive type classification of Holstein-Friesian cows;Legates;J. Dairy Sci.,1971
5. Biases in the estimation of the regression of milk production on age;Miller;J. Dairy Sci.,1964