An attempt for an Amazon geoid model using Helmert gravity anomalyBlitzkow, D.; Matos, A.C.O.C.de; Campos, I.O.; Ellmann, Artu; Vanicek, P.; Santos, M.C.Observing our changing Earth : proceedings of the 2007 IAG General Assembly : Perugia, Italy, July 2-13, 20072009 / p. 187-194 : ill

Evaluation of Stokes-Helmert geoid model computation using a synthetic gravity fieldSantos, M.C.; Vanicek, P.; Ellmann, ArtuJoint Scientific Congress "Bridging Environmental Science, Policy, and Resource Management". Session : Gravity, Geoid and Height Systems2013

The relation between the rigorous and Helmert's definitions of orthometric heightsSantos, M.C.; Vanicek, P.; Featherstone, W.E.; Kingdon, R.; Ellmann, Artu; Martin, B.-A.; Kuhn, M.; Tenzer, RobertJournal of geodesy2006 / 12, p. 691-704