1. The mobility of the small ions of the atmosphere at Poona;Agarwala;Indian. J. Met. Geophys.,1951
2. Observations on the Radium A content of the atmosphere;Burke,1950
3. Carrier mobility spectra of spray electrified liquids;Chapman;Phys. Rev.,1937
4. Factors affecting the nature of ions in air;Erikson;Phys. Rev.,1929
5. Novy metod izsledovanija ionnovo spektra w atmosfere;Fedorow;Doklady AN SSSR,1952