1. Atkinson , D. H. Measurement of planetary wind fields by Doppler monitoring of an atmospheric entry vehicle Pullman 1989
2. Gravity field of the Saturnian system from Pioneer and Voyager tracking data;Campbell;Astron. J.,1989
3. European Space Agency National Aeronautics and Space Administration Cassini Saturn Orbiter and Titan Probe Paris 1988
4. Titan's atmosphere: Temperature and dynamics;Flasar;Nature,1981
5. Flury , W. Cassini mission-Titan probe trajectory, The solid bodies of the outer solar system, Eur. Space Agency Spec. Publ. 242 1986