%% You should probably cite draft-ietf-sshm-cert instead of this I-D.
@techreport{miller-ssh-cert-03,
    number =    {draft-miller-ssh-cert-03},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-miller-ssh-cert/03/},
    author =    {Damien Miller},
    title =     {{SSH Certificate Format}},
    pagetotal = 24,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {This document presents a simple certificate format that may be used in the context of the Secure Shell (SSH) protocol for user and host authentication.},
}