Near-Infrared Spectroscopy as a Rapid Screening Method for the Determination of Total Anthocyanin Content in Sambucus Fructus oleh Stefan Stuppner, Sophia Mayr, Anel Beganovic, Krzysztof Beć, Justyna Grabska, Urban Aufschnaiter, Magdalena Groeneveld, Matthias Rainer, Thomas Jakschitz, Günther K. Bonn, Christian W. Huck