Kr. Ivanova, Stefka, Petia D. Genova-Kalou, Silvia Em. Voleva, Svetla G. Angelova, Borislav M. Marinov, Viktor Em. Manolov, and Stoian Shishkov. 2016. “Infectious Agents and Miscarriage in Bulgaria”. American Scientific Research Journal for Engineering, Technology, and Sciences 25 (1):1-10. https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/2008.