@article{DAN_1978_238_3_a0,
     author = {V. A. Arzumanian and A. M. Vershik},
     title = {Factor representations of the crossed product of a commutative $C^*$-algebra and a semigroup of its endomorphisms},
     journal = {Doklady Akademii Nauk},
     pages = {513--516},
     publisher = {mathdoc},
     volume = {238},
     number = {3},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_238_3_a0/}
}