M. H. Hagemann, U. Ute, G. Weber, and J. N. Wünsche, “Gene structure and allelic variations of hop (Humulus lupulus L.) bitter acid biosynthesis genes”, BrSc, vol. 72, no. 11/12, pp. 207–216, Dec. 2019, doi: 10.23763/BrSc19-25hagemann.