@article{Yang2010,
author = {Yang, Y.  and Waliji, M. },
title= {Increment-decrement life table estimates of happy life expectancy for the U.S. Population},
year = {2010},
doi = {10.1007/s11113-009-9162-5},
journal = {Population Research and Policy Review },
volume = {29},
pages = {775--795},
}