Ushvitskiy, L.I., Kulagovskaya, T.A., Ter-Grigor'yants, A.A., Maslennikova, N.V. and Puchkova, E.E. 2019. Competency-based approach to the assessment of specialists using the theory of fuzzy sets. Amazonia Investiga. 8, 22 (Sep. 2019), 31–39.