@INCOLLECTION\{IMM1981-0306,
    author       = "A. A. Nielsen",
    title        = "Om at holde hus med energien",
    year         = "1981",
    booktitle    = "Energih{\aa}ndbogen",
    volume       = "",
    number       = "",
    series       = "",
    publisher    = "{OVE,} Organisationen for Vedvarende Energi",
    address      = "",
    edition      = "",
    note         = "Invited contribution, in Danish",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/306-full.html"
}