Krupa, K.; Szwerc, W.; Nizinski, P.; Slowik, K.; Błazewicz, A.; Kocjan, R. Assessment of Concentration Changes of Selected Elements in Birch Sap, Depending on Collection Day, Using Atomic Absorption Spectrometry. Curr. Issues Pharm. Med. Sci. 2025, 31 (2), 57-60. https://doi.org/10.1515/cipms-2018-0012.