Geodesic
On representations of groups and algebras in spaces with indefinite metric
Contemporary Mathematics. Fundamental Directions, Dedicated to the memory of Professor N. D. Kopachevsky, Tome 67 (2021) no. 2, pp. 295-315

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The paper contains a survey of known results on the structure of $J$-symmetric operator algebras in Pontryagin and Krein spaces, as well as on representations of groups and *-algebras in these spaces. 
@article{CMFD_2021_67_2_a5,
     author = {E. V. Kissin and V. S. Shulman},
     title = {On representations of groups and algebras in spaces with indefinite metric},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {295--315},
     publisher = {mathdoc},
     volume = {67},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2021_67_2_a5/}
}
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E. V. Kissin; V. S. Shulman. On representations of groups and algebras in spaces with indefinite metric. Contemporary Mathematics. Fundamental Directions, Dedicated to the memory of Professor N. D. Kopachevsky, Tome 67 (2021) no. 2, pp. 295-315. http://geodesic.mathdoc.fr/item/CMFD_2021_67_2_a5/