Altukhov, A. A., A. Y. Mityagin, and A. V. Shustrov. “Electronic Nose Based on a Matrix of Elementary Semiconductor Resistive Sensors”. Technology and Design in Electronic Equipment, no. 4, Aug. 2007, pp. 16-18, https://www.tkea.com.ua/index.php/journal/article/view/TKEA2007.4.16.