Kr. Ivanova, Stefka, Svetla G. Angelova, Elitsa N. Golkocheva-Markova, Petia D. Genova-Kalou, Adelina P. Pavlova, and Irina L. Georgieva. 2017. “A Review on Dried Blood Spots (DBS) As Alternative, Archival Material for Detection of Viral Agents (Measles, Mumps, Rubella, Hepatitis B Virus)”. American Scientific Research Journal for Engineering, Technology, and Sciences 30 (1):161-72. https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/2804.