@misc{rfc1431,
    series =    {Request for Comments},
    number =    1431,
    howpublished =  {RFC 1431},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC1431},
    url =       {https://www.rfc-editor.org/info/rfc1431},
    author =    {Paul Barker},
    title =     {{DUA Metrics (OSI-DS 33 (v2))}},
    pagetotal = 19,
    year =      1993,
    month =     feb,
    abstract =  {This document defines a set of criteria by which a DUA implementation, or more precisely a Directory user interface, may be judged. This memo provides information for the Internet community. It does not specify an Internet standard.},
}