Development of an innovative methodology of research of systems on an example of a shadow economy as an invariant of system of economic security of state von Yegorova-Gudkova, Tatiana, Bojko, Maksim, Neustroiev, Yurii, Khostash, Oleg, Pan, Li, Shepitko, Hryhorii, Beloborodko, Vitalij, Zvirkov, Oleg, Kirilina, Maryna, Matjukhina, Irina

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