@article{Irwin1949,
author = {Irwin, J.O.},
title= {The standard error of expectation of
life, with special reference to expectation of tumourless life in
experiments with mice},
year = {1949},
doi = {10.1017/S0022172400014443},
journal = {The Journal of Hygiene},
volume = {47},
number = {2},
pages = {188--189},
}