@article{DAN_1981_256_2_a9,
     author = {Yu. M. Gusev and V. N. Efanov and V. G. Krymskii},
     title = {On the use of symmetrized sets for constructing an order mapping of matrices of transition functions of multiply connected systems},
     journal = {Doklady Akademii Nauk},
     pages = {299--302},
     publisher = {mathdoc},
     volume = {256},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_256_2_a9/}
}