%% You should probably cite draft-ietf-ccamp-wson-yang instead of this I-D.
@techreport{lee-ccamp-wson-yang-04,
    number =    {draft-lee-ccamp-wson-yang-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-lee-ccamp-wson-yang/04/},
    author =    {Young Lee and Dhruv Dhody and Xian Zhang and Aihua Guo and Victor Lopez and Daniel King and Bin Yeong Yoon},
    title =     {{A Yang Data Model for WSON Optical Networks}},
    pagetotal = 17,
    year =      2015,
    month =     dec,
    day =       15,
    abstract =  {This document provides a YANG data model for the routing and wavelength assignment (RWA) TE topology in wavelength switched optical networks (WSONs).},
}