1. Akins, S., et al. 2009. Status of the PDS unified planetary coordinates database and the planetary image locator tool (PILOT). In: 40th LPSC, LPI contribution no. 2002.
2. Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2009
3. Erratum to: Reports of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2006 & 2009
4. Cecconi, B., Erard, S., André, N., Jacquey, C., Génot, V., Henry, F., Bonnin, X., Le Sidaner, P., Chauvin, C., Fuller, N., Braga, V.F., Aboudarham, J., Louys, M., Derrière, S., Preite-martinez, A., 2014. Solar system UCDs: assessment study of Unified Content Descriptors (UCDs) for the solar system resources (Planetary sciences and Heliophysics). IVOA-IPDA Working Draft, v0.6 (7/2014).
5. EPN data model version 1.18a (last version to date) can be found here: http://www.europlanet-idis.fi/documents/public_documents/Data_Model_v1.18a.pdf. EPN-TAP full documentation: http://voparis-europlanet.obspm.fr/xml/TAPCore/.