Richiedi una copia del documento: MR3535311 Reviewed Inoue, H.(J-KYUSGM); Takakura, M.(J-FUE-AM) Regular biorthogonal pairs and pseudo-bosonic operators. (English summary) J. Math. Phys. 57 (2016), no. 8, 083503, 9 pp. 81Q10 (42B35 81Q12)

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