1. Arnold, J. E., 1961: Some characteristics of severe Texas thunder-storms. Final Rep., Texas A. and M. Project 237, 47–73.
2. Atlas, D., W. G. Harper, F. H. Ludlam and W. C. Macklin, 1960: Radar scatter by large hail. Quart. J. R. meteor. Soc., 86, 468–482.
3. Atlas, D. and F. H. Ludlam, 1961: Multi-wavelength radar reflectivity of hailstorms. Quart. J. R. meteor. Soc., 87, 523–534.
4. Bates, F. C., 1961: The Great Plains squall-line thunderstorm—a model. Ph.D. thesis, St. Louis Univ.
5. Battan, L. J., 1959: Radar meteorology. Chicago, Univ. of Chicago Press, 161 pp.