Shafey, T.M., Al-Mohsen, T.H., Al-Sobayel, A.A., Al-Hassan, M.J., and Ghannam, M. M. (2002). Effects of eggshell pigmentation and egg size on the spectral properties and characteristics of eggshell of meat and layer breeder eggs. Asian-Australasian Journal of Animal Sciences, 15:297-302
(Abstract).