%% You should probably cite draft-ietf-roll-unaware-leaves instead of this I-D.
@techreport{thubert-roll-unaware-leaves-00,
    number =    {draft-thubert-roll-unaware-leaves-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-thubert-roll-unaware-leaves/00/},
    author =    {Pascal Thubert},
    title =     {{RPL-BIER}},
    pagetotal = 10,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {This specification updates RFC 6550 and RFC 6775 unicast routing service in a RPL domain to 6LoWPAN ND nodes that do not participate to the routing protocol.},
}