Freitas, J., Teixeira, A. & Dias, J. (2014). Can ultrasonic doppler help detecting nasality for silent speech interfaces?:  An exploratory analysis based on alignement of the doppler signal with velum aperture information from real-time MRI. In Andreas Holzinger ; Stephen Fairclough; Dennis Majoe,; Hugo Plácido da Silva  (Ed.), Proceedings of the International Conference on Physiological Computing Systems (PhyCS 2014). Lisboa: SciTePress.