Yankova, Elina, Petka Grancharova, and Rozalia Nikolova. β€œOn the Reproductive Biology of Alkanna Tinctoria (Boraginaceae)”. Proceedings of the Bulgarian Academy of Sciences 75, no. 7 (July 29, 2022): 1000–1008. Accessed December 6, 2022. http://www.proceedings.bas.bg/index.php/cr/article/view/117.