@misc{rfc8174,
    series =    {Request for Comments},
    number =    8174,
    howpublished =  {RFC 8174},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC8174},
    url =       {https://www.rfc-editor.org/info/rfc8174},
    author =    {Barry Leiba},
    title =     {{Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words}},
    pagetotal = 4,
    year =      2017,
    month =     may,
    abstract =  {RFC 2119 specifies common key words that may be used in protocol specifications. This document aims to reduce the ambiguity by clarifying that only UPPERCASE usage of the key words have the defined special meanings.},
}