Sa. Mccullough et L. Rodman, NORMAL GENERALIZED SELF-ADJOINT OPERATORS IN KREIN SPACES, Linear algebra and its applications, 283(1-3), 1998, pp. 239-245
A full description is given of n-selfadjoint normal operators in Krein
spaces of finite defect, as well as in general Krein spaces. Both rea
l and complex Krein spaces are considered. (C) 1998 Elsevier Science I
nc. All rights reserved.