@article{KWW2006a,
    TITLE = {Understanding Mortality Rate Deceleration and Heterogeneity},
   AUTHOR = {David R. Steinsaltz and Kenneth W. Wachter},
  JOURNAL = {Mathematical Population Studies},
   VOLUME = {13},
   NUMBER = {1},
    PAGES = {19--37},
     YEAR = {2006},
       ID = {info:doi/10.1080/08898480500452117},
 ABSTRACT = {Generic relationships between heterogeneity in population frailty
             and flattening of aggregate population hazard functions at extreme
             ages are drawn from classical mathematical results on the limiting
             behavior of Laplace transforms. In particular, it shows that the
             population hazard function converges to a constant precisely when
             the distribution of unobserved heterogeneity in initial mortalities
             behaves asymptotically as a polynomial near zero.},
   }