%% You should probably cite rfc6031 instead of this I-D.
@techreport{ietf-keyprov-symmetrickeyformat-11,
    number =    {draft-ietf-keyprov-symmetrickeyformat-11},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-keyprov-symmetrickeyformat/11/},
    author =    {Sean Turner and Russ Housley},
    title =     {{Cryptographic Message Syntax (CMS) Symmetric Key Package Content Type}},
    pagetotal = 29,
    year =      2010,
    month =     aug,
    day =       9,
    abstract =  {This document defines the symmetric key format content type. It is transport independent. The Cryptographic Message Syntax (CMS) can be used to digitally sign, digest, authenticate, or encrypt this content type. {[}STANDARDS-TRACK{]}},
}