@misc{rfc2157,
    series =    {Request for Comments},
    number =    2157,
    howpublished =  {RFC 2157},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC2157},
    url =       {https://www.rfc-editor.org/info/rfc2157},
    author =    {Harald T. Alvestrand},
    title =     {{Mapping between X.400 and RFC-822/MIME Message Bodies}},
    pagetotal = 49,
    year =      1998,
    month =     jan,
    abstract =  {This document defines how to map body parts of X.400 messages into MIME entities and vice versa, including the handling of multipart messages and forwarded messages. {[}STANDARDS-TRACK{]}},
}