Mendoza-López, J. , Sánchez-Solano, S. , Huertas-Díaz, J.. "Characterization and Modeling of Piezoelectric Integrated Micro Speakers for Audio Acoustic Actuation". World Academy of Science, Engineering and Technology, Open Science Index 58, International Journal of Electrical and Computer Engineering, (2011), 5(10), 1307 - 1313.