On measurable Hermitian indefinite functions with a finite number of negative squares

Langer Heinz
1983

Über eine Klasse nichtlinearer Eigenwertprobleme

Langer Heinz
1973

Factorization of operator pencils

Langer Heinz
1976

Generalized resolvents of contractions

Langer Heinz, Textorius Björn
1982

Convergence of generalized Nevanlinna functions

Langer Heinz, Luger Annemarie, Matsaev Vladimir
2011

Some propositions on analytic matrix functions related to the theory of operators in the space Πx

Krein Mark Grigor'evič, Langer Heinz
1981

Über die Q-Funktion eines π-hermetischen Operators im Raume Πx /

Krein Mark Grigor'evič, Langer Heinz
1973

Sturm-liouville problems with coefficients which depend analytically on the eigenvalue parameter

Atkinson Frederick Valentine, Langer Heinz, Mennicken Reinhard
1993