Bilek, Maciej, Marcin Olszewski, Michał Gostkowski, and Ewa Cieślik. “The Usefulness of Birch Saps from the Area of Podkarpacie to Produce Birch Syrup”. Biotechnology and Food Science 80, no. 1 (February 29, 2016): 11-18. Accessed March 12, 2025. https://eczasopisma.p.lodz.pl/BFS/article/view/464.