Guspi, F., et al. “Calculation of Gravity Effects of Tridimensional Structures by Analytical Integration of a Polyhedric Approximation and Application to the Inverse Problem”. Geofisica Internacional, vol. 26, no. 3, July 1987, pp. 407-28, doi:10.22201/igeof.00167169p.1987.26.3.1313.