Gómez, M., V. M. Rodríguez, A. E. Rodríguez, J. Chuvieco, and E. Chuvieco. “Road Design through a GIS: Construction Costs and Enviromental Costs”. Ciudad Y Territorio Estudios Territoriales, no. 104, June 1995, pp. 361-76, https://recyt.fecyt.es/index.php/CyTET/article/view/84041.