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Richter, Klaus and Tanner, Gregor and Wintgen, Dieter (1993) Semiclassical Quantization of the Helium Atom. In: Grabert, Hermann, (ed.) Proceedings of the Fourth International Conference Path Integrals from meV to MeV: Path integrals from meV to MeV. World Scientific, Singapore, London, Hong-Kong, pp. 73-80. ISBN 981-02-1497-9.