M. Stéger-Máté, E. Horváth, and J. Barta, “Evaluation of elder (Sambucus nigra) varieties and candidates for the canning industry. Results of the composition studies”, Int. j. hortic. sci., vol. 7, no. 1, pp. 102–107., Mar. 2001, doi: 10.31421/IJHS/7/1/259.