Kristkova, E., A. Lebeda, A. Novotna, I. Dolezalova, and T. Berka. “Morphological Variation of Lactuca Serriola L. Achenes As a Function of Their Geographic Origin”. Acta Botanica Croatica, vol. 73, no. 1, Apr. 2014, https://www.abc.botanic.hr/index.php/abc/article/view/742.