Bills, B.G., Ray, R.D. Lunar Orbital Evolution: A Synthesis of Recent Results. „Geophysical Research Letters”. 26 (19), s. 3045–3048, 1999. DOI: 10.1029/1999GL008348. Bibcode: 1999GeoRL..26.3045B.
Adelberger, E.G., Heckel, B.R., Smith, G., Su, Y. i inni. Eötvös experiments, lunar ranging and the strong equivalence principle. „Nature”. 347 (6290), s. 261–263, 20 września 1990. DOI: 10.1038/347261a0. Bibcode: 1990Natur.347..261A.
Bills, B.G., Ray, R.D. Lunar Orbital Evolution: A Synthesis of Recent Results. „Geophysical Research Letters”. 26 (19), s. 3045–3048, 1999. DOI: 10.1029/1999GL008348. Bibcode: 1999GeoRL..26.3045B.
Adelberger, E.G., Heckel, B.R., Smith, G., Su, Y. i inni. Eötvös experiments, lunar ranging and the strong equivalence principle. „Nature”. 347 (6290), s. 261–263, 20 września 1990. DOI: 10.1038/347261a0. Bibcode: 1990Natur.347..261A.
James G. Williams, Jean O. Dickey: Lunar Geophysics, Geodesy, and Dynamics. ilrs.gsfc.nasa.gov. [dostęp 2008-05-04]. [zarchiwizowane z tego adresu (2006-10-15)]. 13th International Workshop on Laser Ranging, October 7–11, 2002, Washington, D. C.
James G. Williams, Jean O. Dickey: Lunar Geophysics, Geodesy, and Dynamics. ilrs.gsfc.nasa.gov. [dostęp 2008-05-04]. [zarchiwizowane z tego adresu (2006-10-15)]. 13th International Workshop on Laser Ranging, October 7–11, 2002, Washington, D. C.