Starokozheva G.I., I.V. Mitrofanova I.V., Batmanova V.V. Significance of specially protected nature areas in protection of resource potential of urbanized regions (the case of Volgograd region) // IOP Conf. Series: Materials Science and Engineering 828 (2020) 012026 IOP Publishing. doi:10.1088/1757-899X/828/1/012026