Maksimov, Anatoliy G., Arsenii D. Zavalishin, Maxim V. Abramov, and Alexander L. Tulupyev. “Adjacency Tree Families and Complementarity Criteria”. Computer Tools in Education, no. 1 (March 28, 2020): 28-37. Accessed April 25, 2024. http://cte.eltech.ru/ojs/index.php/kio/article/view/1617.