%% You should probably cite draft-ietf-stox-core instead of this I-D.
@techreport{saintandre-sip-xmpp-core-01,
    number =    {draft-saintandre-sip-xmpp-core-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-saintandre-sip-xmpp-core/01/},
    author =    {Peter Saint-Andre and Avshalom Houri and Joe Hildebrand},
    title =     {{Interworking between the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence Protocol (XMPP): Core}},
    pagetotal = 13,
    year =      ** No value found for 'doc.pub_date.year' **,
    month =     ** No value found for 'doc.pub_date' **,
    day =       ** No value found for 'doc.pub_date.day' **,
    abstract =  {As a foundation for the definition of application-specific, bi- directional protocol mappings between the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence Protocol (XMPP), this document specifies the architectural assumptions underlying such mappings as well as the mapping of addresses and error conditions.},
}