Faustino, Sílvia Maria Mathes, and Carlos E. de M. Bicudo. “Genus Octacanthium (Zygnemaphyceae, Desmidiaceae) in the State of São Paulo, Brazil”. Biota Neotropica, vol. 3, no. 1, Jan. 2003, https://www.biotaneotropica.org.br/BN/article/view/1565.