1. AKIM, E. L., DOKLADY AKADEMII NAUK SSSR 170: 799 (1966).
2. ECKERT, W.J., ON MOTIONS OF PERIGEE AND NODE AND DISTRIBUTION OF MASS IN MOON, ASTRONOMICAL JOURNAL 70: 787 (1965).
3. JEFFREYS, H, DYNAMICS OF MOON, PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES 296: 245 (1967).
4. Characteristics and format of the tracking data to be obtained by the NASA deep space instrumentation facility for Lunar Orbiter 1965
5. Compressed tracking data used for first iteration in selenodesy experiment Lunar Orbiter I and II 1967