@article { Siu2008-bmmd, title = {Power density requirement of a 4 MHz micro-ultrasonic transducer for sonodynamic therapy}, journal = {Biomedical Microdevices}, volume = {10}, number = {1}, year = {2008}, month = {Feb}, pages = {89--97}, type = {article}, URL = {http://dx.doi.org/10.1007/s10544-007-9113-z}, author = { Siu, T. and Rohling, R. and Chiao, M. } }