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Langer, Heinz; Najman, Branko; Tretter, Christiane (2008). Spectral theory of the Klein-Gordon equation in Krein spaces. Proceedings of the Edinburgh Mathematical Society, 51(3), pp. 711-750. Cambridge: Cambridge University Press 10.1017/S0013091506000150
Langer, Heinz; Najman, Branko; Tretter, Christiane (2006). Spectral theory of the Klein-Gordon equation in Pontryagin spaces. Communications in mathematical physics, 267(1), pp. 159-180. Heidelberg: Springer 10.1007/s00220-006-0022-4
