@misc{rfc2156,
    series =    {Request for Comments},
    number =    2156,
    howpublished =  {RFC 2156},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC2156},
    url =       {https://www.rfc-editor.org/info/rfc2156},
    author =    {Steve Kille},
    title =     {{MIXER (Mime Internet X.400 Enhanced Relay): Mapping between X.400 and RFC 822/MIME}},
    pagetotal = 144,
    year =      1998,
    month =     jan,
    abstract =  {This document relates primarily to the ITU-T 1988 and 1992 X.400 Series Recommendations / ISO IEC 10021 International Standard. This ISO/ITU-T standard is referred to in this document as "X.400", which is a convenient shorthand. {[}STANDARDS-TRACK{]}},
}