%% You should probably cite draft-penno-sfc-yang-15 instead of this revision.
@techreport{penno-sfc-yang-13,
    number =    {draft-penno-sfc-yang-13},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-penno-sfc-yang/13/},
    author =    {Reinaldo Penno and Paul Quinn and Danny Zhou and Johnson Li},
    title =     {{Yang Data Model for Service Function Chaining}},
    pagetotal = 58,
    year =      2015,
    month =     mar,
    day =       3,
    abstract =  {This document defines a YANG data model that can be used to configure and manage Service Function Chains.},
}