1. International Reference Ionosphere-IRI 79;rawer;United States Environmental Data Service World Data Center A for Solar-Terrestrial Physics Report UAG,1981
2. Documentation and Description of the Bent Ionospheric Model
3. The Development of a highly successful worldwide empirical ionospheric model and its use in certain aspects of space communications and world-wide total electron content investigations;bent;Effect of Ionosphere on Space Systems and Communication,1976
4. An analytical model of the electron density profile in the ionosphere