Noninvasive assessment of the ventricular relaxation time constant (tau) in humans by Doppler echocardiography
Circulation (1997) - Comment
pubmed: 8994430  doi: 10.1161/01.cir.95.1.151  issn: 0009-7322  issn: 1524-4539 

Gregory M. Scalia, Neil L. Greenberg, Patrick M. McCarthy, James D. Thomas, Pieter M. Vandervoort