Wu, X. F.; Shi, H. P.; Tsang, P; Keung, E (2008). "Induction and in vitro culture of hairy roots of Solanum nigrum L. Var. Pauciflorum Liou and its solasodine production". Fen zi xi bao sheng wu xue bao = Journal of molecular cell biology / Zhongguo xi bao sheng wu xue xue hui zhu ban. Quyển 41 số 3. tr. 183–91. PMID18630597.
Venkateswarlu, J., Krishna Rao, M., Inheritance of fruit colour in the Solanum nigrum complex, Proceedings: Plant Sciences, Volume 74, Number 3, pp137-141, DOI: 10.1007/BF03050624. [1][liên kết hỏng]