Design of Verbal Models for Forming an Optimal Strategy for Sustainable Development of Service Enterprises in the Conditions of a Crisis von O. M. Hutsa, D. B. Yelchaninov, T. V. Merkulova, V. V. Kyriy, N. V. Ihumentseva, N .V. Dovgopol, S. I. Zabuga, Yu. Petrova, O. V. Peresada, V. A. Kutsak

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