A. Pérez, M. N. Reyes, and J. Cuevas, “Germination of Two Papaya Varieties: Effect of Seed Aeration, K-treatment, Removing of the Sarcotesta, High Temperature, Soaking in Distilled Water, and Age of Seeds”, JAUPR, vol. 64, no. 2, pp. 173–180, Apr. 1980.