Radwan, L. M.; Fathi, M.; Galal, A.; El-Dein, A. Z. Mechanical and Ultrastructural Properties of Eggshell in Two Egyptian Native Breeds of Chicken. Int. J. Poult. Sci. 2009, 9 (1), 77–81. https://doi.org/10.3923/ijps.2010.77.81.