Malys, Stephen; Seago, John H.; Pavlis, Nikolaos K.; Seidelmann, P. Kenneth; Kaplan, George H.(2015).”Why the Greenwich meridian moved”.Journal of Geodesy89(12): sid.1263–1272. doi:10.1007/s00190-015-0844-y. ISSN0949-7714.
Malys, Stephen; Seago, John H.; Pavlis, Nikolaos K.; Seidelmann, P. Kenneth; Kaplan, George H.(2015).”Why the Greenwich meridian moved”.Journal of Geodesy89(12): sid.1263–1272. doi:10.1007/s00190-015-0844-y. ISSN0949-7714.