R. T. P. C. Branco, G. L. F. Portela, O. de A. A. Barbosa, P. R. R. Silva, and L. E. de M. Pádua, “Faunistic analysis of the insects associated to sugar-cane production in transition area amazon rain forest - cerrado (palm jungle) União region, state of Piauí - Brazil”, Semina: Ciênc. Agrár., vol. 31, no. 4Sup1, pp. 1121–1132, Feb. 2011.