RT Journal Article SR Electronic T1 Vacuum Pan Operation in Production of Concentrated Grape Juice JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 177 OP 185 DO 10.5344/ajev.1951.2.1.177 VO 2 IS 1 A1 J. L. Riddell YR 1951 UL http://www.ajevonline.org/content/2/1/177.abstract AB