@book{Lee2001,
author = {Lee, R.D.},
title= {Demography Abandons Its Core},
year = {2001},
doi = {10.1353/dem.2001.0036},
URL = {http://www.demog.berkeley.edu/~rlee/papers/FormalDemog.pdf (Retrieved on January 2015)},
address = {Berkeley, CA},
}