I. Gohberg, D. A. (2017). Spectral theory in inner product spaces and applications: 6th Workshop on Operator Theory in Krein Spaces and Operator Polynomials, Berlin, December 2006. Springer.

I. Gohberg, D. Alpay. Spectral Theory in Inner Product Spaces and Applications: 6th Workshop On Operator Theory in Krein Spaces and Operator Polynomials, Berlin, December 2006. Springer, 2017.

I. Gohberg, D. Alpay. Spectral Theory in Inner Product Spaces and Applications: 6th Workshop On Operator Theory in Krein Spaces and Operator Polynomials, Berlin, December 2006. Springer, 2017.