%% You should probably cite draft-ietf-teas-ietf-network-slice-use-cases instead of this I-D.
@techreport{contreras-teas-slice-nbi-04,
    number =    {draft-contreras-teas-slice-nbi-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-contreras-teas-slice-nbi/04/},
    author =    {Luis M. Contreras and Shunsuke Homma and Jose A. Ordonez-Lucena},
    title =     {{IETF Network Slice Use Cases and Attributes for Northbound Interface of IETF Network Slice Controllers}},
    pagetotal = 14,
    year =      ** No value found for 'doc.pub_date.year' **,
    month =     ** No value found for 'doc.pub_date' **,
    day =       ** No value found for 'doc.pub_date.day' **,
    abstract =  {This document analyses the needs of potential customers of network slices realized with IETF techniques in several use cases, identifies the functionalities for the North Bound Interface (NBI) of an IETF Network Slice Controller to satisfy such requests.},
}