B. Golemanov, P. Gecov, D. Svinarov, S. Siminkovitch, B. Vladimirov1 , M. K ovacheva-Slavova1 ,J. Genov , R. Mitova. 2016. “Vitamin D Deficiency In Chronic Pancreatitis”. International Journal of Medical Science and Clinical Invention 3 (6). http://valleyinternational.net/index.php/ijmsci/article/view/521.