Affiliation: | 1. Faculty of Mathematics & Mechanics, St.Petersburg State University, 28, University avenue, Petrodvoretz, 198504, St.Petersburg, Russia 2. Department of Management and Engineering, University of Padova, Stradella S. Nicola, 3, 36100, Vicenza, Italy 3. Department of Land, Environment, Agriculture and Forestry, University of Padova, Viale dell’University, 16, Legnaro, 35020, Padua, Italy
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