%% You should probably cite draft-ietf-core-multipart-ct instead of this I-D.
@techreport{fossati-core-multipart-ct-05,
    number =    {draft-fossati-core-multipart-ct-05},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-fossati-core-multipart-ct/05/},
    author =    {Carsten Bormann},
    title =     {{Multipart Content-Format for CoAP}},
    pagetotal = 6,
    year =      2018,
    month =     jun,
    day =       8,
    abstract =  {This memo defines application/multipart-core, an application- independent media-type that can be used to combine representations of several different media types into a single CoAP message-body with minimal framing overhead, each along with a CoAP Content-Format identifier.},
}