@inproceedings { Ou-trans11, title = {A Passive Check Valve Using Microspheres for Low Pressure and Low Flow Rate Applications}, journal = {16th Int. Conference on Solid State Sensors and Actuators (Transducers'11), Technical Digest}, year = {2011}, pages = {1785-1788}, type = {inproceedings}, author = { Ou, K. and Chiao, M. } }