1) Dalen, N., L. G. Hellstrom, and B Jacobson. 1976. Bone mineral content and mechanical strength of the femoral neck. Acta Orthop Scan 47: 503-508.
2) Palle, S., L. Vico, S. Borrin, and C. Alexandre. 1992. Bone tissue response to four-month antiorthostatic bedrest: A bone histomorphometric study. Calcif Tissue Int 51: 189-194.
3) LeBlanc, A., V. Schneider, J. Krebs, H. Evans, S. Jhingran, and P. Johnson. 1987. Spinal bone mineral after 5 weeks of bed rest. Calcif Tissue Int 41: 259-261.
4) Weinreb, M., G. A. Rodan, and D. D. Thompson. 1989. Osteopenia in the immobilized rat hind limb is associated with increased bone resorption and decreased bone formation. Bone 10: 187-194.
5) Nilsson, B. E, and N. E. Westlin. 1971. Bone density in athletes. Clin Orthop 77: 179-182.