@inproceedings{peter1969renewal,
title={Renewal theory and the almost sure convergence of branching processes},
author={Peter Jagers},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203441263417101},
booktitle={Arkiv for Matematik},
volume={7},
number={6},
pages={495-504},
year={1969},
}
Peter Jagers. Renewal theory and the almost sure convergence of branching processes. 1969. Vol. 7. In Arkiv for Matematik. pp.495-504. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203441263417101.