A co-twin study of the effect of calcium supplementation on bone density during adolescence - Nowson, C. A.; Green, R. M.; Hopper, J. L.; Sherwin, A. J.; Young, D.; Kaymakci, B.; Guest, C. S.; Smid, M.; Larkins, R. G.; Wark, J. D. (Springer, 1997)
http://dx.doi.org/10.1007/BF01622292
Keywords: WW-YZ