@article{Siegel1976,
author = {Siegel, J.S. and Passel, J.S.},
title= {New estimates of number of centenarians in United-States},
year = {1976},
doi = {10.2307/2285583},
journal = {Journal of the American Statistical Association},
volume = {71},
number = {355},
pages = {559--566},
}