A. Rahafrooz, and S. Pourkamali, “Detection of sub-ppm traces of aqueous heavy-metal ions using micro-electro-mechanical beam resonators,” Journal of Micromechanics and Microengineering, vol. 19, no. 11, 115003, September 2009. 
A. Rahafrooz, and S. Pourkamali, “Detection of sub-ppm traces of aqueous heavy-metal ions using micro-electro-mechanical beam resonators,” Journal of Micromechanics and Microengineering, vol. 19, no. 11, 115003, September 2009.