Quantification of CO2 in wines with piezoelectric crystals coated with tetramethylammonium fluoride and comparison with other methods M.T.S.R. Gomes, T.A.P. Rocha, A.C. Duarte and J.A.B.P. Oliveira Analusis, 26 4 (1998) 179-181 DOI: 10.1051/analusis:1998100