I. Petelkov, V. Shopska, R. Denkova-Kostova, K. Ivanova, G. Kostov, and V. Lyubenova, “Investigation of Fermentation Regimes for the Production of Low-alcohol and Non-alcohol Beers”, Period. Polytech. Chem. Eng., vol. 65, no. 2, pp. 229–237, Jan. 2021.