1. Bartels J (196o) Geophysics. Fischer, Frankfurt
2. Endres L (1989) Radiators. In: Erb W (Editor) Introduction to spectroradiometry. Springer, Berlin Heidelberg New York
3. Gerlach W (1960) Physics. Fischer, Frankfurt
4. Lompe A (1969) Technical-scientific proceedings of the Osram company, vol 1o. Springer, Berlin Heidelberg New York
5. Meyer AEH, Seitz EO (1949) Ultraviolet rays. De Gruyter, Berlin