RT Journal Article SR Electronic T1 A Method for the Extraction of Grape Berries Used in Total Acid, Potassium, and Individual Acid Analysis JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 49 OP 49 DO 10.5344/ajev.1983.34.1.49 VO 34 IS 1 A1 LEONARD R. MATTICK YR 1983 UL http://www.ajevonline.org/content/34/1/49.abstract AB