Fedotova, I., Kryvoruchko, O., Shynkarenko, V., Bocharova, N., Sotnychenko, L. and Dimitrakieva, S. (2019) “Using the elements from a fuzzy sets theory in the process of diagnosing the loyalty of consumers of motor transport services”, Eastern-European Journal of Enterprise Technologies, 3(3 (99), pp. 39–49. doi: 10.15587/1729-4061.2019.169079.