STIEFKENS, L., and G. BERNARDELLO. “KARYOTYPE STUDIES IN LYCIUM SECTIONS SCHISTOCALYX AND SCLEROCARPELLUM (SOLANACEAE)”. Edinburgh Journal of Botany, vol. 62, no. 1-2, Feb. 2006, pp. 53-67, https://doi.org/10.1017/S0960428606000023.