L. C. de Oliveira, J. C. Tavares, G. S. de O. Rodrigues, P. B. Maracaja, and M. L. da Silva, “EFFECT OF DIFFERENT SUBSTRATES IN SEED GERMINATION AND INITIAL TRAINING OF SEEDLINGS OF GRAVIOLA”, Green Journal, vol. 4, no. 1, pp. 90–97, Feb. 2009.