%% You should probably cite draft-irtf-t2trg-rest-iot instead of this I-D.
@techreport{keranen-t2trg-rest-iot-04,
    number =    {draft-keranen-t2trg-rest-iot-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-keranen-t2trg-rest-iot/04/},
    author =    {Ari Keränen and Matthias Kovatsch},
    title =     {{RESTful Design for Internet of Things Systems}},
    pagetotal = 18,
    year =      2017,
    month =     mar,
    day =       13,
    abstract =  {This document gives guidance for designing Internet of Things (IoT) systems that follow the principles of the Representational State Transfer (REST) architectural style.},
}