@article{TM_1978_148_a20,
     author = {S. S. Ryshkov},
     title = {Multidimensional sails},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {211--217},
     year = {1978},
     volume = {148},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1978_148_a20/}
}