%% You should probably cite draft-ietf-teas-yang-te-topo instead of this I-D.
@techreport{liu-teas-yang-te-topo-01,
    number =    {draft-liu-teas-yang-te-topo-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-liu-teas-yang-te-topo/01/},
    author =    {Xufeng Liu and Igor Bryskin and Vishnu Pavan Beeram and Tarek Saad},
    title =     {{YANG Data Model for TE Topologies}},
    pagetotal = 50,
    year =      2015,
    month =     mar,
    day =       25,
    abstract =  {This document defines a YANG data model for representing and manipulating TE Topologies.},
}