@article{Humphrey1970,
author = {Humphrey, G.T.},
title= {Mortality at the oldest ages},
year = {1970},
URL = {http://www.actuaries.org.uk/__data/assets/pdf_file/0003/19956/0105-0119.pdf},
journal = {Journal of the Institute of Actuaries},
volume = {96},
pages = {105--119},
}