%% You should probably cite rfc3548 instead of this I-D.
@techreport{josefsson-base-encoding-04,
    number =    {draft-josefsson-base-encoding-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-josefsson-base-encoding/04/},
    author =    {Simon Josefsson},
    title =     {{The Base16, Base32, and Base64 Data Encodings}},
    pagetotal = 13,
    year =      2002,
    month =     may,
    day =       13,
    abstract =  {This document describes the commonly used base 64, base 32, and base 16 encoding schemes. It also discusses the use of line-feeds in encoded data, use of padding in encoded data, use of non-alphabet characters in encoded data, and use of different encoding alphabets. This memo provides information for the Internet community.},
}