%% You should probably cite draft-xibassnez-i2nsf-capability instead of this I-D.
@techreport{xia-i2nsf-capability-interface-im-01,
    number =    {draft-xia-i2nsf-capability-interface-im-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-xia-i2nsf-capability-interface-im/01/},
    author =    {Liang Xia and Dacheng Zhang and Nicolas Bouthors},
    title =     {{Information Model of Interface to Network Security Functions Capability Interface}},
    pagetotal = 17,
    year =      2015,
    month =     may,
    day =       25,
    abstract =  {This draft is focused on the north-bound interface of NSFs (Network Security Functions) and proposes an information model for configuring various kinds NSF security functions, based on the packet-based paradigm. The Yang structure and use examples are also presented to clarify how to use the information model.},
}