Raghavan 2003, p. 45. Raghavan, S. (2003). "Radar Meteorology — History, Principles and Technology". In Sadourny, Robert; Mysak, Lawrence A. (eds.). Radar Meteorology. Atmospheric and Oceanographic Sciences Library. Vol. 27. Kluwer Academic Publishers. pp. 1–49. doi:10.1007/978-94-017-0201-0_1. ISBN978-1-4020-1604-2.