Abarca B., L.D. et al. 2011. Assessment of Eggshell Quality Before and After Incubation from 29 and 46 Weeks-old Leghorn Hens. International Journal of Poultry Science. 10, 12 (Nov. 2011), 977–982. DOI:https://doi.org/10.3923/ijps.2011.977.982.