JOHNSTON, M.; STEVENS, R. L. A systematic approach to analyzing environmental issues involving complex systems (a web-based course). Ecocycles, [S. l.], v. 1, n. 2, p. 46-50, 2015. DOI: 10.19040/ecocycles.v1i2.38. Disponível em: https://www.ecocycles.net/ojs/index.php/ecocycles/article/view/38. Acesso em: 26 sep. 2020.