@article{TM_2019_304_a12,
     author = {Yu. S. Ledyaev},
     title = {Criteria for {Convexity} of {Closed} {Sets} in {Banach} {Spaces}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {205--220},
     publisher = {mathdoc},
     volume = {304},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2019_304_a12/}
}