For citations:
Spitsin V.V., Spitsina L.Yu. Sustainability, Effectiveness and Efficienc of Enterprises in High-Tech Sectors in Crisis Conditions: Econometric Modelling. Vestnik NSUEM. 2020;(2):160-176. (In Russ.) https://doi.org/10.34020/2073-6495-2020-2-160-176