@article{INTM_1969_a2,
     author = {M. A. Naimark and R. S. Ismagilov},
     title = {Representations of groups and algebras in spaces with indefinite metric},
     journal = {Itogi nauki i tehniki. Seri\^a, Matemati\v{c}eskij analiz},
     pages = {73--105},
     publisher = {mathdoc},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTM_1969_a2/}
}