%% You should probably cite rfc7421 instead of this I-D.
@techreport{ietf-6man-why64-07,
    number =    {draft-ietf-6man-why64-07},
    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-6man-why64/07/},
    author =    {Brian E. Carpenter and Tim Chown and Fernando Gont and Sheng Jiang and Alexandre Petrescu and Andrew Yourtchenko},
    title =     {{Analysis of the 64-bit Boundary in IPv6 Addressing}},
    pagetotal = 24,
    year =      2014,
    month =     oct,
    day =       19,
    abstract =  {The IPv6 unicast addressing format includes a separation between the prefix used to route packets to a subnet and the interface identifier used to specify a given interface connected to that subnet. Currently the interface identifier is defined as 64 bits long for almost every case, leaving 64 bits for the subnet prefix. This document describes the advantages of this fixed boundary and analyses the issues that would be involved in treating it as a variable boundary.},
}