%% You should probably cite rfc3168 instead of this I-D.
@techreport{ietf-tsvwg-ecn-04,
    number =    {draft-ietf-tsvwg-ecn-04},
    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-tsvwg-ecn/04/},
    author =    {Sally Floyd and Dr. K. K. Ramakrishnan and David L. Black},
    title =     {{The Addition of Explicit Congestion Notification (ECN) to IP}},
    pagetotal = 63,
    year =      2001,
    month =     jun,
    day =       8,
    abstract =  {This memo specifies the incorporation of ECN (Explicit Congestion Notification) to TCP and IP, including ECN's use of two bits in the IP header. {[}STANDARDS-TRACK{]}},
}