A. E. Faki, E. Obeid, H. I. Osman, and A. Amin, “Ostrich (Struthio camelus ) Egg Embryonic Death During Artificial Incubation”, Int J Appl Sci Biotechnol, vol. 3, no. 4, pp. 566–578, Dec. 2015, doi: 10.3126/ijasbt.v3i4.13523.