Method of optical self-mixing for pulse wave transit time measurement in comparison with other methods and correlation with blood pressureMeigas, Kalju; Lass, Jaanus; Kattai, Rain; Karai, Deniss; Kaik, JüriCoherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VIII : 26-28 January 2004, San Jose, California, USA2004 / p. 444-453 : ill https://www.spiedigitallibrary.org/conference-proceedings-of-spie/5316/1/Method-of-optical-self-mixing-for-pulse-wave-transit-time/10.1117/12.524273.full#_=_