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Langer Heinz; Luger Annemarie; Matsaev Vladimir: Convergence of generalized Nevanlinna functions. In: Acta scientiarum mathematicarum, (77) 3-4. pp. 425-437. (2011)
Atkinson Frederick Valentine; Langer Heinz; Mennicken Reinhard: Sturm-liouville problems with coefficients which depend analytically on the eigenvalue parameter. In: Acta scientiarum mathematicarum, (57) 1-4. pp. 25-44. (1993)
Langer Heinz: On measurable Hermitian indefinite functions with a finite number of negative squares. In: Acta scientiarum mathematicarum, (45). pp. 281-292. (1983)
Langer Heinz; Textorius Björn: Generalized resolvents of contractions. In: Acta scientiarum mathematicarum, (44) 1-2. pp. 125-131. (1982)
Krein Mark Grigor'evič; Langer Heinz: Some propositions on analytic matrix functions related to the theory of operators in the space Πx. In: Acta scientiarum mathematicarum, (43) 1-2. pp. 181-205. (1981)
Langer Heinz: Factorization of operator pencils. In: Acta scientiarum mathematicarum, (38) 1-2. pp. 83-96. (1976)
Krein Mark Grigor'evič; Langer Heinz: Über die Q-Funktion eines π-hermetischen : Operators im Raume Πx. In: Acta scientiarum mathematicarum, (34). pp. 191-230. (1973)
Langer Heinz: Über eine Klasse nichtlinearer Eigenwertprobleme. In: Acta scientiarum mathematicarum, (35). pp. 73-86. (1973)
