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Liudmila Vasilevna Kashirskaya, Alexey Alexandrovich Sitnov, Maiya Anatolevna Azarskaya, Yulia Aleksandrovna Zurnadzhyants 2020. Economical and mathematical methods for monitoring environmentally significant business systems. International Journal of Advanced Science and Technology. 29, 9s (May 2020), 2241 - 2253.