%% You should probably cite rfc2171 instead of this I-D.
@techreport{maruyama-mapos-sonet-01,
    number =    {draft-maruyama-mapos-sonet-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-maruyama-mapos-sonet/01/},
    author =    {Mitsuru Maruyama and Ken-ichiro Murakami},
    title =     {{MAPOS - Multiple Access Protocol over SONET/SDH Version 1}},
    pagetotal = 9,
    year =      1997,
    month =     apr,
    day =       25,
    abstract =  {This memo documents a multiple access protocol for transmission of network-protocol datagrams, encapsulated in High-Level Data Link Control (HDLC) frames, over SONET/SDH. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.},
}