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

On evaluation of the mean gravity gradient within the topographyTenzer, Robert; Ellmann, ArtuObserving our changing Earth : proceedings of the 2007 IAG General Assembly : Perugia, Italy, July 2-13, 20072009 / p. 253-261 : ill

The Earth's gravity field components of the differences between gravity disturbances and gravity anomaliesTenzer, Robert; Ellmann, Artu; Novak, Pavel; Vajda, PeterObserving our changing Earth : proceedings of the 2007 IAG General Assembly : Perugia, Italy, July 2-13, 20072009 / p. 155-159 : ill