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Odessa Institute of Marine Engineers. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 10, No. 1, pp. 67–72, January–March, 1976.
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Shmul'yan, Y.L. The theory of linear relations and spaces with an indefinite metric. Funct Anal Its Appl 10, 56–60 (1976). https://doi.org/10.1007/BF01075773
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DOI: https://doi.org/10.1007/BF01075773