Stable carbon isotopic composition of the wine and CO2 bubbles of sparkling wines: detecting C4 sugar additions - Martinelli, Luiz Antonio; Moreira, Marcelo Zacharias; Ometto, Jean Pierre Henry Balbaud; Alcarde, Andrea R; Rizzon, Luiz Antenor; Stange, Erik; Ehleringer, James R (Journal of Agricultural and Food Chemistry, 2003)