Минаев, Ю. Н., О. Ю. Филимонова, and Ю. И. Минаева. “Comparative Analysis of the Structural Characteristics of Clear and Fuzzy Sets”. Problems of Informatization and Control, vol. 1, no. 41, Mar. 2013, pp. 55-60, doi:10.18372/2073-4751.1.7206.