@article{Sverdrup1965,
author = {Sverdrup, E.},
title= {Estimates and test procedures in connection with stochastic models for deaths, recoveries and transfers between different states of health},
year = {1965},
journal = {Skandinavisk Aktuarietidskrift},
volume = {1965},
number = {3-4},
pages = {184--211},
}