1. Bancaber, G. N.: The Meteorological Behavior and Characteristics of Thunderstorms U. S. Weather Bureau, Hydromet. section, Wash. D. C. (1942).
2. Workman, E. J., R. E. Holzer, and G. T. Pelser: The Electrical Structure of Thunderstorms. Nat. Advisory Committee for Aernoautics, Techn. Note NO 864 Wash. D. C. (1942).
3. Byers, H. R., and R. R. Braham: The Thunderstorm. U. S. Weather Bureau, Wash. D. C. 287 pp. (1949).
4. Israel, H.: Probleme der Gewitterforschung. I. Forschungsber. des Landes Nordrhein-Westfalen, Nr. 1408,17 (1964).
5. Israel, H.: Das Gewitter. In: Probl. d. Kosmischen Physik, Bd. XXV, Leipzig: Akad. Verl. Ges. 1950.