H. Langer
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Articles: 2
Continuations of Hermitian indefinite functions and corresponding canonical systems: an example
Heinz Langer, Matthias Langer, Zoltán Sasvári
MFAT 10 (2004), no. 1, 39-53
39-53
A self-adjoint linear pencil $Q-\lambda P$ of ordinary differential operators
Heinz Langer, Reinhard Mennicken, Christiane Tretter
MFAT 2 (1996), no. 1, 38-54
38-54