@inproceedings{inproceedings8f17df0c,
title   = {Multimodal and unimodal functionally graded piezoelectric ultrasonic transducers},
author = {Montealegre Rubio, Wilfredo and Silva, Emílio Carlos Nelli and Buiochi, Flávio},
year = {2009},
doi = {10.1109/ULTSYM.2009.5441803},
publisher = {IEEE},
booktitle   = {IEEE International Ultrasonics Symposium}
}