L. Tao, I. Yoshio, S. Kyoko and M. Haruhiko, “Development of Wearable Sensor Combinations for Human Lower Extremity Motion,” Proceedings 2006 IEEE International Conference on analysis in Robotics and Automation, ICRA 2006.
 H. Zhou, T. Stone, H. S. Hu and N. Harris, “Use of Multiple Wearable Inertial Sensors in Upper Limb Motion Tracking,” Medical Engineering & amp; Physics. Vol. 30, No. 1, 2008, pp. 123-133.
 R. Liu, J. Z. Zhou, M. Liu and X. F. Hou, “A Wearable Acceleration Sensor System for Gait Recognition,” Proceedings of the 2nd IEEE Conference in Industrial Electronics and Applications, 2007.
 3-Space Sensor, User Manual, YEI Technology.
 J. Shlens, “A tutorial on Principal Components Analysis, Version 2,” Salk institute for Biological Studies and Institute for Nonlinear Science, University of California, San Diego, 2005.
 T. F. Novacheck, “The Biomechanics of Running,” Gait & amp; Posture, Vol. 7, No. 1, 1998, pp. 77-95.
 M. Hanlon and R. Anderson, “Real-time gait event detection using wearable sensors,” Gait & amp; Posture, Vol. 30, No. 4, 2009, pp. 523-527.
 A. Minami, H. Teruo, O. Tomoyuki, K. Kazuyuki, W. Kajiro and K. Yosuke, “A Study on Gait Analysis by Measuring Axis Rotation Based on 3D Magnetic and Acceleration Sensors,” Proceedings of SICE Annual Conference 2010.