S. D. S. Campos, M. L. A. Bovi, and M. Iaderoza, “Characterization of palm heart harvested from several crossing combinations between <i>E. Oleracea</i> Mart. and <i>E. edulis</i> Mart. growing under different conditions. I. Raw material”, PAB, vol. 26, no. 5, pp. 637–646, May 1991.