1. Feteris , P. J. 1956 Wolkenfysica Mededelingenblad Werkgroep Wolken en onweders
2. Radar observations of showers suggesting a coalescence mechanism;Feteris;Quart. J.R. Met. Soc.,1956
3. The structure of rainclouds;Ludlam;Weather,1956
4. The formation of precipitation;Saunders;Ibid.,1956