Volkova V., Loginova A. (2018). Multilevel hierarchical models as a method of conservation of integrated representation in the studying or engineering the system. System analysis in economics – 2018: Proceedings of the V International research and practice conference–biennale (21–23 november 2018). Moscow, Prometheus publishing house, pp. 284-287. DOI: 10.33278/SAE-2018.eng.284-287