1. Balmino G, Perosanz F, Rummel R, Sneeuw N, Sünkel H, Woodworth P 1998: European Views on Dedicated Gravity Field Missions: GRACE and GOCE, An Earth Sciences Division Consultation Document, ESA, ESD-MAG-REP-CON-001
2. The Current Limits of Resolution for Surface Wave Tomography in North America;Bassin C.;EOS Trans AGU,2000
3. ESA 1999: Gravity Field and Steady-State Ocean Circulation Mission, ESA SP-1233(1), Report for mission selection of the four candidate earth explorer missions, ESA Publications Division