1. ALBRIGHT, F. (1947): Osteoporosis, Ann. intern. Med., 27, 86I.
2. Histological Assessment of Osteoporosis by Iliac Crest;BECK, J.S.; NORDIN, B.E.C.;Biopsy, J. Path. Bact,1960
3. A Study of the Tisdall Method for Determination of Blood Serum Calcium with a Suggested Modification;CLARK, E.P.; COLLIP, J.B.;J. biol. Chem,1925
4. Cowdry's 'Problems of Ageing';COBB, W.M.;ch,1952
5. DENT, C. E., and HARPER, C. M. (1962): parathyroidism, Lancet, i, 559.