@article{IVM_2013_10_a7,
     author = {M. A. Sevodin},
     title = {Sets convex in a~cone of directions},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {73--76},
     publisher = {mathdoc},
     number = {10},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2013_10_a7/}
}