Relationship between pain and intersegmental spinal motion characteristics in low-back pain subjects. - James P. Dickey; Michael R. Pierrynowski; Victoria Galea; Drew A. Bednar; Simon X. Yang (SMC, 2000)

Frenet-Serret and the Estimation of Curvature and Torsion. - Kwang-Rae Kim; Peter T. Kim; Ja-Yong Koo; Michael R. Pierrynowski (IEEE J. Sel. Top. Signal Process., 2013)