@article{https://resolver.caltech.edu/CaltechAUTHORS:20200113-110853879,
    title = "Acoustic Wave Propagation in an Underwater Sound Channel 1. Qualitative Theory",
    journal = "IMA Journal of Applied Mathematics",
    year = "1971",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200113-110853879",
    id = "record",
    issn = "0272-4960",
    doi = "10.1093/imamat/8.2.186",
    volume = "8"
}


@article{https://resolver.caltech.edu/CaltechAUTHORS:20200110-142501972,
    title = "Acoustic Wave Propagation in an Underwater Sound Channel 2. Quantitative Theory",
    journal = "IMA Journal of Applied Mathematics",
    year = "1971",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200110-142501972",
    id = "record",
    issn = "0272-4960",
    doi = "10.1093/imamat/8.2.199",
    volume = "8"
}