Juncai, Hou, et al. “Application of Modified Quartz Crystal Sensors: Detection of Isobutyl Alcohol, Ethyl Acetate and Ethylene”. International Journal of Agricultural and Biological Engineering, vol. 7, no. 5, Oct. 2014, pp. 71-77, https://www.ijabe.migration.pkpps06.publicknowledgeproject.org/index.php/ijabe/article/view/1260.