Goc, Z., K. Kilian, G. Formicki, R. Stawarz, A. GreÅ„, and R. Muchacka. “CALCIUM AND MAGNESIUM CONCENTRATION OF BREAST MILK IN RELATION WITH AGE AND PARITY OF NURSING WOMEN”. Journal of Microbiology, Biotechnology and Food Sciences, vol. 2, no. 1, Aug. 2012, pp. 329-37, https://office2.jmbfs.org/index.php/JMBFS/article/view/7211.