References
- Bartko , John J. and Pettigrew , Karen D. 1968 . A note on the correlation of parts with wholes . The American Statistician , 22 ( 4 ) : 41
- Searle , S. R. and Henderson , C. R. 1960 . Establishing age-correction factors related to the level of herd production . J. Dairy Science , 42 : 824 – 35 .