DEL RIO, E. (2014). ON ACCURATE GEOID MODELING: DERIVATION OF DIRICHLET PROBLEMS THAT GOVERN GEOIDAL UNDULATIONS AND GEOID MODELING BY MEANS OF THE FINITE DIFFERENCE METHOD AND A HYBRID METHOD. Boletim De Ciências Geodésicas, 20(2). https://doi.org/10.5380/bcg.v20i2.36746