Dreval, A., L. Marchenkova, and O. Lesniak. “A Modern Opinion Concerning the Role of Calcium and Vitamin D in the Prevention and Treatment of Osteoporosis”. ORTHOPAEDICS TRAUMATOLOGY and PROSTHETICS, no. 4, Oct. 2009, pp. 123-7, doi:10.15674/0030-598720094123-127.