1. Cooper C, Campion G, Melton LJ III. Hip fractures in the elderly: a world-wide projection. Osteoporosis Int 1992;2:285–9.
2. Elffors I, Allander E, Kanis JA, et al. The variable Incidence of hip fracture in Southern Europe: the MEDOS Study. Osteoporosis Int 1994;4:253–63.
3. Mikhailov EE, Benevolenskaya LI. Retrospektivoe izucheniye perelomov bedrennoy kostii credii naseleniya g. Elektrostal. In: Benevolenskaya LI, Mikhailov EE, Muravyev YV, Milov NM, Rodionova SS, Speransky AE, Yakusheva EO, exditors. Pervii Rossisky Symposium po Osteoporozu. Moscow: Assotsiatsiya Revmatologove Rossiyi, 1995: 94–5.
4. WHO technical report series;WHO,1994
5. Masaryk P, Letkovska A, Wendl J, et al. Consequences and secular trends in femoral neck fracture in Slovakia. In: Ring EJF, Elvins DM, Ghalla AK, editors. The 1994 Bath Conference on Osteoporosis and Bone Mineral Measurement. Bath: British Institute of Radiology, 1994:25.