%% You should probably cite draft-petra-green-api-05 instead of this revision.
@techreport{petra-green-api-04,
    number =    {draft-petra-green-api-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-petra-green-api/04/},
    author =    {Alberto Rodriguez-Natal and Luis M. Contreras and Marisol Palmero and Jan Lindblad and Adrián Gallego Sánchez},
    title =     {{Path Energy Traffic Ratio API (PETRA)}},
    pagetotal = 18,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {This document describes an API to query a network regarding its Energy Traffic Ratio for a given path.},
}