Mazurek, A., P. Baran, A. Błażewicz, P. Januszewicz, K. Jop, and J. Maurin. “Medicines and preparations of unknown origin used illegally for pharmacological abortive purposes”. European Journal of Clinical and Experimental Medicine, vol. 10, no. 2, June 2012, pp. 238–244, https://journals.ur.edu.pl/ejcem/article/view/12768.