%% You should probably cite rfc2823 instead of this I-D.
@techreport{ietf-pppext-sdl-05,
    number =    {draft-ietf-pppext-sdl-05},
    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-pppext-sdl/05/},
    author =    {James D. Carlson and Paul Langner and James Manchester and Enrique J. Hernandez-Valencia},
    title =     {{PPP over Simple Data Link (SDL) using SONET/SDH with ATM-like framing}},
    pagetotal = 28,
    year =      1999,
    month =     oct,
    day =       19,
    abstract =  {This document extends methods found in the Point-to-Point Protocol (PPP) and RFCs 1662 and 2615 to include a new encapsulation for PPP called Simple Data Link (SDL). SDL provides a standard method for transporting multi-protocol datagrams over point-to-point links, and RFCs 1662 and 2615 provide a means to carry PPP over Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH) circuits. SDL provides a very low overhead alternative to HDLC-like encapsulation, and can also be used on SONET/SDH links. This memo defines an Experimental Protocol for the Internet community.},
}