Gutiérrez, A., J. Burgos, C. Garcerá, M. Zarzo, M. Ruiz, and E. Moltó. “Optimization of an Aroma Sensor for Assessing Grape Quality for Wine Making”. Spanish Journal of Agricultural Research, Vol. 5, no. 2, June 2007, pp. 157-63, doi:10.5424/sjar/2007052-235.