MELNIKOV, V. Y.; CHERKASOVA, M. A.; SEREGIN, A. V.; STEPANENKO, D. A.; A. MUSHINSKIY, M.; A. STEPANENKO, R. A STUDY OF EXTREMISM AS A COMPLEX INTER-BRANCH CONCEPT. Humanities & Social Sciences Reviews, v. 7, n. 4, p. 72-79, 4 Jul. 2019.