%% You should probably cite rfc8099 instead of this I-D.
@techreport{ietf-ospf-ttz-03,
    number =    {draft-ietf-ospf-ttz-03},
    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-ospf-ttz/03/},
    author =    {Huaimo Chen and Richard Li and Alvaro Retana and Yi Yang and Vic Liu and Mehmet Toy},
    title =     {{OSPF Topology-Transparent Zone}},
    pagetotal = 24,
    year =      2016,
    month =     mar,
    day =       11,
    abstract =  {This document presents a topology-transparent zone in an OSPF area. A topology-transparent zone comprises a group of routers and a number of links connecting these routers. Any router outside of the zone is not aware of the zone. The information about the links and routers such as a link down inside the zone is not advertised to any router outside of the zone.},
}