Ignatov I, Popova TP, Bankova R, Neshev N. Spectral analyses of fresh and dry Hypericum perforatum L. Effects with colloidal nano silver 30 ppm. Plant Sci. Today [Internet]. 2022 Jan. 1 [cited 2024 Nov. 21];9(1):41-7. Available from: https://horizonepublishing.com/journals/index.php/PST/article/view/1429