Roy, A. E.; Ovenden, M. W. (1954-04-01). “On the Occurrence of Commensurable Mean Motions in the Solar System”. Monthly Notices of the Royal Astronomical Society114 (2): 232–241. doi:10.1093/mnras/114.2.232. ISSN0035-8711.
Roy, A. E.; Ovenden, M. W. (1954-04-01). “On the Occurrence of Commensurable Mean Motions in the Solar System”. Monthly Notices of the Royal Astronomical Society114 (2): 232–241. doi:10.1093/mnras/114.2.232. ISSN0035-8711.