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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 7, No. 3, pp. 699–707, May–June, 1966.
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Shmul'yan, Y.L. Composition of operators in finite dimensional spaces with indefinite metrics. Sib Math J 7, 561–566 (1966). https://doi.org/10.1007/BF00966252
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DOI: https://doi.org/10.1007/BF00966252