Narvaez-Solarte, W.; Rostagno, H. S.; Soares, P. R.; Uribe-Velasquez, L. F.; Silva, M. A. Nutritional Requirement of Calcium in White Laying Hens from 46 to 62 Wk of Age. Int. J. Poult. Sci. 2006, 5 (2), 181–184. https://doi.org/10.3923/ijps.2006.181.184.