Fathi, M.M., et al. “Using Scanning Electron Microscopy to Detect the Ultrastructural Variations in Eggshell Quality of Fayoumi and Dandarawi Chicken Breeds”. International Journal of Poultry Science, vol. 6, no. 4, Mar. 2007, pp. 236–241, https://doi.org/10.3923/ijps.2007.236.241.