Áron Soós, N. Tóth, Éva Bódi, S. Várallyay, S. Molnár, and B. Kovács, “The effect of the preparation method on the physical and chemical characteristics of propolis tinctures”, Acta agrar. Debr., no. 74, pp. 163–168, Jun. 2018, doi: 10.34101/actaagrar/74/1683.