Skomra, U. i Koziara-Ciupa, M. 2020. Stability of the hop bitter acids during long-term storage of cones with different maturity degree. Polish Journal of Agronomy. 40, 40 (mar. 2020), 16–24. DOI:https://doi.org/10.26114/pja.iung.406.2020.40.03.