@article{DAN_1960_131_3_a30,
     author = {F. M. Perel'man},
     title = {Representation of multicomponent systems by models},
     journal = {Doklady Akademii Nauk},
     pages = {578--579},
     publisher = {mathdoc},
     volume = {131},
     number = {3},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_131_3_a30/}
}