Machado, J. “Interpolação Das Curvas De nível No Programa Surfer 8.0 através De Imagens Do Google Earth | Interpolation of Level Curves in the Surfer 8.0 Program through Google Earth Images”. Geama Journal - Environmental Sciences, vol. 1, no. 3, Apr. 2016, pp. 311-2, https://journals.ufrpe.br/index.php/geama/article/view/511.