%% You should probably cite draft-ietf-bier-path-mtu-discovery instead of this I-D.
@techreport{mirsky-bier-path-mtu-discovery-01,
    number =    {draft-mirsky-bier-path-mtu-discovery-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-mirsky-bier-path-mtu-discovery/01/},
    author =    {Greg Mirsky and Tony Przygienda and Andrew Dolganow},
    title =     {{Path Maximum Transmission Unit Discovery (PMTUD) for Bit Index Explicit Replication (BIER) Layer}},
    pagetotal = 8,
    year =      2016,
    month =     apr,
    day =       5,
    abstract =  {This document describes Path Maximum Transmission Unit Discovery (PMTUD) in Bit Indexed Explicit Replication (BIER) layer.},
}