Weiss, K.M. 1990 The biodemography of variation in human frailty. Demography 27:185-206.
Woodbury, M.A., K.G. Manton, and E. Stallard 1981 Longitudinal models for chronic disease risk: An evaluation of logistic multiple regression and alternatives. International Journal of Epidemiology 10:187-197.
Yeung, A.C., V.I. Vekshtein, D.S. Krantz, J.A. Vita, T.J. Ryan, P. Ganz, and A.P. Selwyn 1991 The effects of atherosclerosis on the vasomotor response of coronary arteries to mental stress. New England Journal of Medicine 325:1551-1556.
Zaman, Z., S. Roche, P. Fielden, P. Frost, D. Niriella, and A. Cayley 1992 Plasma concentrations of vitamins A and E carotenoids in Alzheimer's disease. Age and Ageing 21(2):91-94.
Zheng, Z.X., Z.S. Wang, H.M. Zhu, J.Y. Yang, H.Y. Peng, L.X. Wang, J. Li, X.W. Jiang, and Y.F. Yu 1993 Survey of 160 centenarians in Shanghai. Age and Ageing 22:16-19.