Campos RA, Machado W, Stipp NAF. Diagnosis of an enviromental system: the case hydrographical micro basin of Ribeirão das Marrecas in Londrina - PR - Brazil. S&N [Internet]. 2005 May 30 [cited 2024 Dec. 22];1(1). Available from: https://seer.ufu.br/index.php/sociedadenatureza/article/view/9716