Woo, D. , Park, J. , Kim, C. , Lee, T. , Lee, B. , Kim, H.. "Influence of Calcium Intake Level to Osteoporptic Vertebral bone and Degenerated Disc in Biomechanical Study". World Academy of Science, Engineering and Technology, Open Science Index 34, International Journal of Biomedical and Biological Engineering, (2009), 3(10), 289 - 291.