List A low-noise oscillator based on a multi-membrane CMUT for high sensitivity resonant chemical sensors Author H. J. Lee, K. K. Park, P. Cristman, Ö. Oralkan, M. Kupnik, and B. T. Khuri-Yakub* Conference Proc. 22th IEEE MEMS Conference, Sorrento, Italy, pp. 761-764 Year 2009 .