Bilek, M., Sądej, M., Rączy, M., Rębisz, A. and Sosnowski, S. 2016. Turbidity changes of birch tree sap after addition of commonly available chemicals . Biotechnology and Food Science. 80, 2 (Dec. 2016), 83-90. DOI:https://doi.org/10.34658/bfs.2016.80.2.83-90.