Kirjackis, Jevgenijus, Edmundas Mazėtis, and Grigorijus Melničenko. “On the Insolubility of One Drawing Problem”. Lietuvos matematikos rinkinys 56, no. B (December 20, 2015): 70–74. Accessed January 31, 2026. https://www.journals.vu.lt/LMR/article/view/17714.