Минаев, Ю.Н., Филимонова, О.Ю. and Минаева, Ю.И. 2013. Comparative analysis of the structural characteristics of clear and fuzzy sets. Problems of Informatization and Control. 1, 41 (Mar. 2013), 55–60. DOI:https://doi.org/10.18372/2073-4751.1.7206.