Pereira, T. A.; Felisberto, S. A.; Fernandes, V. O. <b>Spatial Variation of Periphyton Structural Attributes on <i>Eichhornia crassipes</i> (Mart.) Solms. in a Tropical Lotic ecosystem</b&gt; - Doi: 10.4025/actascibiolsci.V35i3.17879. Acta Sci. Biol. Sci. 2013, 35, 319-326.