%% You should probably cite rfc1326 instead of this I-D.
@techreport{tsuchiya-encap-00,
    number =    {draft-tsuchiya-encap-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-tsuchiya-encap/00/},
    author =    {Paul Tsuchiya},
    title =     {{Mutual Encapsulation Considered Dangerous}},
    pagetotal = 5,
    year =      1991,
    month =     dec,
    day =       4,
    abstract =  {This memo describes a packet explosion problem that can occur with mutual encapsulation of protocols (A encapsulates B and B encapsulates A). This memo provides information for the Internet community. It does not specify an Internet standard.},
}