MANSER, W. W., M. QADIRUDDIN, K. SHIRIN, J. TALATI, and A. M. SYED. “?TRACE ELEMENT STUDIES IN UROLITHIASIS: PRELIMINARY INVESTIGATION ON CALCIUM OXALATE AND MIXED CALCIUM OXALATE-HYDROXYAPATITE URINARY CALCULI”. Biological Sciences - PJSIR, vol. 38, no. 1, Jan. 1995, pp. 8-10, https://v2.pjsir.org/index.php/biological-sciences/article/view/2423.