@article{FAA_1980_14_3_a1,
     author = {I. M. Gel'fand and V. A. Ponomarev},
     title = {Representations of graphs. {Perfect} subrepresentations},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {14--31},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1980_14_3_a1/}
}