%% You should probably cite draft-ietf-roll-rpl-observations instead of this I-D.
@techreport{rahul-roll-rpl-observations-01,
    number =    {draft-rahul-roll-rpl-observations-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-rahul-roll-rpl-observations/01/},
    author =    {Rahul Jadhav and Rabi Narayan Sahoo and Yuefeng Wu},
    title =     {{RPL Observations}},
    pagetotal = 15,
    year =      2018,
    month =     apr,
    day =       23,
    abstract =  {This document describes RPL protocol design issues, various observations and possible consequences of the design and implementation choices.},
}