M. A. Queiroz, J. P. Araújo, and R. C. S. Dias, “Genetic variability in samples of watermelon, Cirtullus lanatus (Thunb.) Matsum & Nakai, collected in six counties of the dry areas of Northeast Brazil”, Sitientibus sér. Ci. Biol., vol. 2, no. 1/2, pp. 44–48, Jun. 2002.