Trifonov-Bogdanov, Peter, Leonid Vinogradov, and Vladimir Shestakov. “Civil Aviation Accidents and Incidents Classified According to Groups of Aviation Specialists”. Aviation 17, no. 2 (July 1, 2013): 76-79. Accessed May 4, 2024. https://journals.vilniustech.lt/index.php/Aviation/article/view/3589.