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Vouilloud, A. A.; Sala, S. E.; Avellaneda, M. N.; Duque, S. R. (2009). Diatoms from the Colombian and Peruvian Amazon: the Genera Encyonema, Encyonopsis and Gomphonema (Cymbellales: Bacillariophyceae). Revista de BiologĂa Tropical. 58(1): 45-62.