%% You should probably cite draft-ietf-pim-rfc4601-update-survey-report instead of this I-D.
@techreport{zzp-pim-rfc4601-update-survey-report-01,
    number =    {draft-zzp-pim-rfc4601-update-survey-report-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-zzp-pim-rfc4601-update-survey-report/01/},
    author =    {Lianshu Zheng and Zhaohui (Jeffrey) Zhang and Rishabh Parekh},
    title =     {{Survey Report on PIM-SM Implementations and Deployments}},
    pagetotal = 15,
    year =      2013,
    month =     apr,
    day =       5,
    abstract =  {This document provides supporting documentation to advance the Protocol Independent Multicast - Sparse Mode (PIM-SM) protocol from IETF Proposed Standard to Internet Standard.},
}