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@article{https://resolver.caltech.edu/CaltechAUTHORS:20200114-082839936,
    title = "Eigenfunction expansions and non-selfadjoint boundary value problems",
    journal = "Communications on Pure and Applied Mathematics",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200114-082839936",
    id = "record",
    issn = "0010-3640",
    doi = "10.1002/cpa.3160170103",
    volume = "17"
}


@article{https://resolver.caltech.edu/CaltechAUTHORS:20200114-081929131,
    title = "Separation of variables and alternative representations for non-selfadjoint boundary value problems",
    journal = "Communications on Pure and Applied Mathematics",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20200114-081929131",
    id = "record",
    issn = "0010-3640",
    doi = "10.1002/cpa.3160170102",
    volume = "17"
}