@article{Dziewonski1981,
    title = "Preliminary reference Earth model",
    journal = "Physics of the Earth and Planetary Interiors",
    volume = "25",
    number = "4",
    pages = "297 - 356",
    year = "1981",
    note = "",
    issn = "0031-9201",
    url = "https://dx.doi.org/10.1016/0031-9201(81)90046-7",
    doi = "10.1016/0031-9201(81)90046-7",
    author = "Adam M. Dziewonski and Don L. Anderson",
}