@article{MMO_1966_15_a10,
     author = {M. A. Naǐmark},
     title = {Conditions for the unitary equivalence of commutative symmetric algebras in the {Pontrjagin} space~$\Pi_k$},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {383--399},
     publisher = {mathdoc},
     volume = {15},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1966_15_a10/}
}