1. Rain-drop size in Hawaiian, rains;Blanchard;J. Meteorol.,1953
2. Davis , M. H. The forces between two spheres in a uniform field RM-2607 The RAND Corporation Santa Monica, Calif. 1960
3. Messungen der Grosse von Wolkenelementen, II;Diem;Met. Rundschau,1948
4. Zur Influenztheorie der Niederschlagselektrizität;Elster;Phys. Z.,1913
5. An unusual observation of lightning;Foster;Bul. Am. Meteorol. Soc.,1950