@other{https://authors.library.caltech.edu/records/q221w-wme32,
    authors = "Gavalas, G. R.",
    title = "Silica membranes for hydrogen separation in coal gas processing. Final report, January 1993",
    publisher = "Caltech Library",
    year = "1993",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20151105-115204740",
    id = "https://authors.library.caltech.edu/records/q221w-wme32"
}


@other{https://authors.library.caltech.edu/records/fzp7x-gr893,
    authors = "Flagan, R. C. and Gavalas, G. R.",
    title = "Thermally induced structural changes in coal combustion. Final report",
    year = "1992",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20151105-120142265",
    id = "https://authors.library.caltech.edu/records/fzp7x-gr893",
    doi = "10.2172/10159795"
}