@article{DAN_1985_285_2_a6,
     author = {U. Raitums},
     title = {The passage to the convex hull of a set of admissible operators in},
     journal = {Doklady Akademii Nauk},
     pages = {289--292},
     publisher = {mathdoc},
     volume = {285},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_285_2_a6/}
}