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46C20 Spaces with indefinite inner product (Krein spaces, Pontryagin spaces, etc.) (3 articles)

• Esmeral, Kevin; Ferrer, Osmin; Jalk, Jorge; Lora Castro, Boris: On hyponormal operators in Krein spaces. (English). Archivum Mathematicum, vol. 55 (2019), issue 4, pp. 249-259
• Bebiano, N.; Providência, J. da; Teixeira, R.: Indefinite numerical range of $3\times 3$ matrices. (English). Czechoslovak Mathematical Journal, vol. 59 (2009), issue 1, pp. 221-239
• Znojil, Miloslav: Conservation of pseudo-norm in $\scr P\scr T$ symmetric quantum mechanics. (English). In: Slovák, Jan and Čadek, Martin (eds.): Proceedings of the 23rd Winter School "Geometry and Physics". Circolo Matematico di Palermo, Palermo, 2004. pp. [211]-218