CELIK, SEZGIN, and ERSIN YUCEL. “Conservation Strategy of Critical Endemic Centaurea Hausknetchii Boiss. (Section: Cyanoroides) and Effects of Different Salt, Nitrate and Acid Concentrations on the Germination of Seeds”. Asian Journal of Chemistry, vol. 20, no. 5, Mar. 2010, pp. 4051-8, https://asianpubs.org/index.php/ajchem/article/view/12801.