%% You should probably cite rfc7840 instead of this I-D.
@techreport{ietf-ecrit-held-routing-04,
    number =    {draft-ietf-ecrit-held-routing-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-ietf-ecrit-held-routing/04/},
    author =    {James Winterbottom and Hannes Tschofenig and Laura Liess},
    title =     {{A Routing Request Extension for the HELD Protocol}},
    pagetotal = 16,
    year =      2015,
    month =     dec,
    day =       9,
    abstract =  {For cases where location servers have access to emergency routing information they are able to return routing information with the location information if the location request includes a request for the desired routing information. This document specifies an extension to the HELD protocol, updating {[}RFC5985{]}, to support this funciton.},
}