1. Shapiro, A. H., The Dynamics and Thermodynamics of Compressible Fluid Flow (Ronald Press Company, New York, 1954), Vol.2, Chap. 21, pp.830-833.
2. Prince, D. C., Jr. "Transonic flow approximation by Sauer's method," General Electric Co.Technical InformationSeries Kept.DF60FPD666 (1960), pp.21-38.
3. Non-two-body reference orbit for Encke's method.