dos Santos, Eloési Machado, Priscila Izabel Tremarin, and Thelma Alvim Veiga Ludwig. 2011. “Periphytic Diatoms on Potamogeton Polygonus Cham. & Schltdl.: First Records from Paraná State”. Biota Neotropica 11 (3). Sao Paulo, Brazil. //www.biotaneotropica.org.br/BN/article/view/856.