1.
Non-invasive diagnosis and assessment of aortic valve disease and evaluation of aortic prosthesis function using echo pulsed Doppler velocimetry
by Veyrat, C
British Heart Journal, 1980, Vol.43 (4), p.393-413

2.
Non-invasive recording of mitral valve flow velocity patterns using pulsed Doppler echocardiography. Application to diagnosis and evaluation of mitral valve disease
by Kalmanson, D
British Heart Journal, 1977, Vol.39 (5), p.517-528
