Bilek M, Vietoris V, Ilko V. Shelf life extension and sensory evaluation of birch tree sap using chemical preservatives. Potr. S. J. F. Sci. [Internet]. 2016 Oct. 13 [cited 2024 Nov. 25];10(1):499-505. Available from: http://potravinarstvo.com/journal1/index.php/potravinarstvo/article/view/649