1. Escobal,P.R ,October 1963, "Rise and set Times of a Satellite about an Oblate Planet," AIAA Journal Vol. I,No. 10, pp.2305-2310.
2. Escobal,P.R. 1965,"Methods of orbit determination, Robert E. Krieger Publishing Company, Huntington, New York, 1965, pp. 26-29 and 360 - 369.
3. Lawton, J. A. January-February, 1987."Numerical Method for Rapidly Determining Satellite - Satellite and Satellite-Ground Station In - View Periods, " Journal of guidance, Navigation, and Control, vol. 10,pp.32-36.
4. Salvatore Alfano , David Negron, Jr., and Jennifer L. Moore, April-June 1992, "Rapid Determination of Satellite Visibility Periods", The Journal of the Astronautical Sciences, Vol.40, No.2, pp.281-295.
5. P. L. Palmer & Yan Mai "A Fast Prediction Algorithm of Satellite Passes", 14th Annual AIAA/USU Conference on Small Satellite, Surrey Space Centre University of Surrey,Guildford,GU2 7XH, UK