Riggs, B. L.; Wahner, H. W.; Seeman, E.; Offord, K. P.; Dunn, W. L.; Mazess, R. B.; Johnson, K. A.; Melton, III, L. J.
Changes in bone mineral density of the proximal femur and spine with aging:​ differences between the postmenopausal and senile osteoporosis syndromes
J Clin Invest. October 1982;​70(4):​716-723