@article{ZVMMF_1965_5_1_a19,
     author = {I. Kh. Sigal and V. A. Chebakov},
     title = {A method of matrix analysis and its application to a problem in the theory of graphs},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {148--150},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1965_5_1_a19/}
}