BIVAND, R. Revisiting the Boston data set - Changing the units of observation affects estimated willingness to pay for clean air. REGION, Vienna, Austria, v. 4, n. 1, p. 109–127, 2017. DOI: 10.18335/region.v4i1.107. Disponível em: https://openjournals.wu-wien.ac.at/ojs/index.php/region/article/view/107. Acesso em: 4 dec. 2024.