@article{Fogel1997,
author = {Fogel, R.W. and Costa, D.L.},
title= {A theory of technophysio evolution, with some implications for forecasting population, health care costs, and pension costs},
year = {1997},
doi = {10.2307/2061659},
journal = {Demography },
volume = {34},
number = {1},
pages = {49‒66},
}