@article{Crotwell1999,
    author = {Crotwell, H. Philip and Owens, Thomas J and Ritsema, Jeroen},
    journal = {Seismological Research Letters},
    number = {2},
    pages = {154--160},
    title = {{The TauP Toolkit: Flexible seismic travel-time and ray-path utilities}},
    url = {http://srl.geoscienceworld.org/content/70/2/154.short},
    volume = {70},
    year = {1999}
}
