L. Göbl and H.-U. Meisch, “Determination of aging-relevant substances in beer by solid phase microextraction/capillar gas chromatography (SPME/GC)”, BrSc, vol. 57, no. 9/10, pp. 56–60, Oct. 2004, Accessed: May 30, 2026. [Online]. Available: https://brewingscience.de/index.php/brewingscience/article/view/552