@article{RM_1993_48_2_a16,
     author = {A. V. Kireeva},
     title = {Subgraphs and factorizations of functional graphs},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {188--189},
     publisher = {mathdoc},
     volume = {48},
     number = {2},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1993_48_2_a16/}
}