M. O. M. Simões, E. A. M. Silva, and S. L. Teixeira, “Ontogeny of adventitious shoots of <i>Citrus sinensis</i> (Linn.) Osbeck cv. pêra cultivated <i>in vitro</i> according to the type of explant used”, PAB, vol. 26, no. 6, pp. 797–805, Jun. 1991.