Ferreira, C. R., Andrade, M. V. A., Magalhães, S. V. G., Franklin, W. R., & Pena, G. C. (2014). A Parallel Algorithm for Viewshed Computation on Grid Terrains. Journal of Information and Data Management, 5(2), 171. https://doi.org/10.5753/jidm.2014.1532