1. European Commission Regulation (EEC) N° 2676/90. Off. J. Eur. Comm. N° L 272/64.
2. European Commission Regulation (EC) No 822/97. Off. J. Eur. Comm. N° L117/10.
3. Commission Regulation (EC) No 440/2003, Annex II. Off. J. Eur. Comm. N° L66/17.
4. International Organisation of Vine and Wine (OIV)—Resolution OENO 17/2001, introducing in Appendix A of the Compendium on International Methods of Wine and Musts the method for the ‘Determination by isotope ratio mass spectrometry of 13C/12C of wine ethanol or that obtained through the fermentation of musts, concentrated musts or grape sugar’. Available: http://www.oiv.int/.
5. International Organisation of Vine and Wine (OIV)—Resolution OENO 7/2005, completing the Annex C of the Compendium of International Methods of Analysis of Musts and Wines by the method for the ‘Determination of the carbon isotope ratio 13C/12C of CO2 in sparkling wines method using isotope ratio mass spectrometry (IRMS)’. Available: http://www.oiv.int/.