Hamoudi, H., I. M. Rodríguez Iglesias, and M. Sanz Martín-Bustamante. “The Equivalence of Convex and Concave Transport Cost in a Circular Spatial Model With and Without Zoning”. Estudios De Economía, vol. 42, no. 1, Sept. 2015, pp. pp. 5-20, https://sintesisdejurisprudencia.uchile.cl/index.php/EDE/article/view/37255.