S.-I. Nitta

In Vivo Measurement of Thickness or of Speed of Sound in Biological Tissue Structures

F. Dunn, M. Tanaka, H. Ohkawai, 1983, IEEE Transactions on Sonics and Ultrasonics.

Autonomic Nervous Activity Revealed by a New Physiological Index /spl rho//sub max/ Based on Cross-Correlation between Mayer-Wave Components of Blood Pressure and Heart Rate

N. Sugita, M. Yoshizawa, T. Yambe, 2006, 2006 SICE-ICASE International Joint Conference.