@other{https://resolver.caltech.edu/CaltechETD:etd-10102006-104831,
    title = "I. Seismic ray-tracing in piecewise homogenous media. II. Analysis of optimal step size selection in homotopy and continuation methods",
    year = "1980",
    url = "https://resolver.caltech.edu/CaltechETD:etd-10102006-104831",
    id = "record",
    doi = "10.7907/djxb-gg89"
}