Горохівець, Н. А., and К. В. Ведмедєва. “Inheritance of Testa Layer and Hypodermis Coloring in Sunflower Pericarp”. The Journal of V.N.Karazin Kharkiv National University. Series «Biology», Vol. 18, no. 1079, May 2013, pp. 71-75, https://periodicals.karazin.ua/biology/article/view/13739.