%% You should probably cite rfc6970 instead of this I-D.
@techreport{ietf-pcp-upnp-igd-interworking-10,
    number =    {draft-ietf-pcp-upnp-igd-interworking-10},
    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-pcp-upnp-igd-interworking/10/},
    author =    {Mohamed Boucadair and Reinaldo Penno and Dan Wing},
    title =     {{Universal Plug and Play (UPnP) Internet Gateway Device - Port Control Protocol Interworking Function (IGD-PCP IWF)}},
    pagetotal = 23,
    year =      2013,
    month =     apr,
    day =       26,
    abstract =  {This document specifies the behavior of the Universal Plug and Play (UPnP) Internet Gateway Device - Port Control Protocol Interworking Function (IGD-PCP IWF). A UPnP IGD-PCP IWF is required to be embedded in Customer Premises (CP) routers to allow for transparent NAT control in environments where a UPnP IGD is used on the LAN side and PCP is used on the external side of the CP router.},
}