Kostov, Ivan, Gergana Ingilizova, and Sergei Slavov. 2021. “SERIOUS MEDICAL ERRORS IN OBSTETRICS AND GYNECOLOGICAL PRACTICE IN BULGARIA - FREQUENCY OF PATIENT’S INJURY AND MORTALITY”. KNOWLEDGE - International Journal 49 (4):749-56. https://ojs.ikm.mk/index.php/kij/article/view/4553.