Trace Element Concentration and Stable Isotope Ratio Analysis in Blueberries and Bilberries: A Tool for Quality and Authenticity Control oleh Linards Klavins, Inessa Maaga, Maris Bertins, Anne Linn Hykkerud, Katja Karppinen, Česlovas Bobinas, Heikki M. Salo, Nga Nguyen, Henriikka Salminen, Karina Stankevica, Maris Klavins