@article{Olshansky1986,
author = {Olshansky, S. Jay and Ault, A. Brian},
title= {The Fourth Stage of the Epidemiologic Transition: The Age of Delayed Degenerative Diseases},
year = {1986},
journal = {The Milbank Quarterly},
volume = {64},
number = {3},
pages = {pp. 355--391. http://www.jstor.org/stable/3350025},
}