%% You should probably cite rfc2375 instead of this I-D.
@techreport{ietf-ipngwg-multicast-assgn-04,
    number =    {draft-ietf-ipngwg-multicast-assgn-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-ipngwg-multicast-assgn/04/},
    author =    {Dr. Steve E. Deering and Bob Hinden},
    title =     {{IPv6 Multicast Address Assignments}},
    pagetotal = 8,
    year =      1997,
    month =     jul,
    day =       16,
    abstract =  {This document defines the initial assignment of IPv6 multicast addresses. This memo provides information for the Internet community. It does not specify an Internet standard of any kind.},
}