Osear Julio Medina Vargas, M. P. E. de J. L. M. M. B. ¬ęPreparation of Polymeric Derivative from Cassava Starch (manihot Esculenta Crantz) and Its Application As Flocculant in Waste Water Treatment¬Ľ. Ciencia En Desarrollo, vol. 3, num. 1, 2012, 269.