00572naa#a2200169#i#450# EN\\bibl\53367 20240429100842.1 2588-0071 20221010b2022####ek#y0engy0150####ca RU Unobserved economy as a barrier to socio-economic development of the region Journal article Nizhny Novgorod Nizhny Novgorod Academy of the Ministry of the Interior of Russia 2022 8 с. Journal article local Myachin Nikolay Valer'evich Shkvarok Vladimir M. namvd.editorum.ru