@article{article80b24169,
title   = {Modeling of functionally graded piezoelectric ultrasonic transducers},
author = {Montealegre Rubio, Wilfredo and Buiochi, Flávio and Adamowski, Júlio Cezar and Silva, Emílio Carlos Nelli},
year = {2009},
doi = {10.3728/icultrasonics.2007.vienna.1184_rubio},
journal   = {Ultrasonics}
}