Babeshko, Vladimir A., Olga M. Babeshko, and Olga V. Evdokimova. 2009. “Solving of the Block Structure Problem Stated by Acad. M.A. Sadovsky”. Ecological Bulletin of Research Centers of the Black Sea Economic Cooperation, no. 1 (March): 18-23. https://vestnik.kubsu.ru/article/view/277.