References:

1. Mcgill S. (2001) Low back stability: from formal description to issues for performance and rehabilitation. Exerc Sports Sci Rev ; 29:26-31.

2. Mcgill S. (2002) Low Back Disorders Evidence-Based Prevention and Rehabilitation.  Illinois. Human Kinetics, pg. 225-227

3. MCGILL, S. M., A. CHILDS, and C. LIEBERMAN. (1999) Endurance times for low back stabilization exercises: clinical targets for testing and training from a normal database. Arch. Phys. Med. Rehabil 80:941–944

4. Mcgill S. (2010) Core Training: Evidence Translating to Better Performance and Injury Prevention. Strength and Conditioning Journal 

5. "Low Back Pain Fact Sheet," NINDS. Publication date July 2003.