LEARMONTH, A. T. A.; PAL, M. N. A method of plotting two variables (such as mean incidence and variability from year to year) on the same map, using isopleths. ERDKUNDE, [S. l.], v. 13, n. 2, p. 145–150, 1959. DOI: 10.3112/erdkunde.1959.02.06. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1271. Acesso em: 7 oct. 2024.