1. Relation of the candling appearance of eggs to their quality;Almquist;U. of Colorado, Ag. Exp. Sta., Bull.,1933
2. Effect of Nicarbazin on egg quality;Baker;Poultry Sci.,1956
3. How to measure egg I.Q. Bureau of Animal Industry;Brant,1952
4. The restriction of ooporphyrin deposition on eggs shells by drug feeding;McLary;Poultry Sci.,1955
5. Studies on the effect of Nicarbazin on reproduction in chickens;Ott;Poultry Sci.,1956