Akçin, Öznur E., and H. Baki. “Fruit Coat Patterns and Morphological Properties of Seven Species of <i>Symphytum</I> L. (boraginaceae) from Turkey”. Bangladesh Journal of Botany, vol. 38, no. 2, May 2010, pp. 185-8, doi:10.3329/bjb.v38i2.5145.