Kállay, M., and D. Nyitrainé Sárdy. “Examination of Nitrogenous Compounds in Hungarian Bio-Musts”. International Journal of Horticultural Science 11, no. 1 (March 14, 2005): 109–113. Accessed March 5, 2021. https://ojs.lib.unideb.hu/IJHS/article/view/569.