Bergmann, L.B.; Demmig, F.: Multilevel Models of Krypton for the Application to Stepwise Ionization Relaxation Processes. In: Zeitschrift für Naturforschung - Section A Journal of Physical Sciences 32 (1977), Nr. 11, S. 1245-1248. DOI:
https://doi.org/10.1515/zna-1977-1107