@article{RM_1965_20_5_a10,
     author = {M. K. Gol'dberg},
     title = {Some applications of the operation of contraction to strongly connected graphs},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {20},
     number = {5},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1965_20_5_a10/}
}