1. H.J. Leisi, “Exotic atom spectroscopy using bent crystals”, Proceedings of the 1st Course of the International School of Physics of Exotic Atoms, Erice, 24–30 April, 1977, eds. G. Fiorentini and G. Torelli, p. 75.
2. “Muonic X-rays with crystal-diffraction spectrometry”;Leisi,1986
3. Vacuum polarization test and search for muonhadron interactions from muonic X-rays:
4. Das fokussierende kristallspektrometer der universität fribourg
5. Precision of curved crystal spectrometers I. Large angle laser interferometer