X. Guo, Y. Yi, and S. Pourkamali, “Thermal-Piezoresistive Resonators and Self-Sustained Oscillators for Gas Recognition and Pressure Sensing,” IEEE Sensors Journal, vol. 13, no. 8, pp. 2863–2872, August 2013. 
X. Guo, Y. Yi, and S. Pourkamali, “Thermal-Piezoresistive Resonators and Self-Sustained Oscillators for Gas Recognition and Pressure Sensing,” IEEE Sensors Journal, vol. 13, no. 8, pp. 2863–2872, August 2013.