Павлов, В. А., П. С. Дюрдева, and Д. С. Шалымов. “Russian Manuscripts Clustering Based on the Feature Relation Graph (FRG)”. Computer Tools in Education, no. 1, Feb. 2016, pp. 24-35, http://cte.eltech.ru/ojs/index.php/kio/article/view/1387.