Zubareva, L.V., Kuramshina, A.V. and Zavedeev, E.V. 2020. Small and medium-sized businesses in towns of commodity regions as source of diversification and modernization of their economy. Amazonia Investiga. 9, 31 (Aug. 2020), 21–35. DOI:https://doi.org/10.34069/AI/2020.31.07.2.