Geodesic
New Proof of Naimark's Theorem on the Existence of Nonpositive Invariant Subspaces for Commuting Families of Unitary Operators in Pontryagin Spaces.
Monatshefte für Mathematik, Tome 109 (1990) no. 2, pp. 153-156.

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Mots-clés : Naimark's theorem on the existence of nonpositive invariant subspaces for commuting families of unitary operators in Pontryagin spaces 
@article{MOMA_1990__109_2_178466,
     author = {Zolt\'an Sasv\'ari},
     title = {New {Proof} of {Naimark's} {Theorem} on the {Existence} of {Nonpositive} {Invariant} {Subspaces} for {Commuting} {Families} of {Unitary} {Operators} in {Pontryagin} {Spaces.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {153--156},
     publisher = {mathdoc},
     volume = {109},
     number = {2},
     year = {1990},
     zbl = {0713.47035},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1990__109_2_178466/}
}
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Zoltán Sasvári. New Proof of Naimark's Theorem on the Existence of Nonpositive Invariant Subspaces for Commuting Families of Unitary Operators in Pontryagin Spaces.. Monatshefte für Mathematik, Tome 109 (1990) no. 2, pp. 153-156. http://geodesic.mathdoc.fr/item/MOMA_1990__109_2_178466/