Operator Theory and Indefinite Inner Product Spaces Presented on the occasion of the retirement of Heinz Langer in the Colloquium on Operator Theory, Vienna, March 2004 - Langer, Matthias; Luger, Annemarie; Woracek, Harald; SpringerLink (Online service) (Basel : Birkhauser Verlag, 2006)
Keywords: Inner product spaces; Linear operators; Differential equations, Linear