@article\{Stadler2013,
 author={Tanja Stadler and  Denise Kuhnert and  Sebastian Bonhoeffer and  Alexei J. Drummond},
 title={{Birth-death skyline plot reveals temporal changes of epidemic spread in HIV and hepatitis C virus (HCV)}},
 journal={Proceedings of the National Academy of Sciences of the United States of America},
 volume={110},
 number={1},
 pages={228--233},
 year={2013},
 note={The website links to a blog post applying this method to SARS-CoV-2}
}