Khan, L., M. T. Siddiqui, N. Ahmad, and N. Shafi. “QUANTITATIVE ESTIMATION OF DIACETYLMORPHINE BY PREPARATIVE TLC AND UV SPECTROSCOPY”. Biological Sciences - PJSIR, vol. 44, no. 5, Oct. 2001, pp. 312-4, http://v2.pjsir.org/index.php/biological-sciences/article/view/1959.