Tadić, V., A. R. Žugić, S. Đorđević, I. Žižović, I. Homšek, D. Mišić, and I. . Nešić. “The RP-HPLC Method for Analysis of Usnic Acid As Potential Marker of Herbal Drugs-Based Formulations Containing Usnea Barbata: Scientific Paper”. Journal of the Serbian Chemical Society, vol. 87, no. 9, Aug. 2022, pp. 1063-7, doi:10.2298/JSC201216045T.