@article{Keyfitz1991,
author = {Keyfitz, N.},
title= {Uncertainty in National Population Forecasting: Issues, Backgrounds, Analyses, Recommendations},
year = {1991},
doi = {10.1080/0032472031000145786},
journal = {Population Studies: A Journal of Demography},
volume = {45},
number = {3},
pages = {545--546},
}