%% You should probably cite rfc9252 instead of this I-D.
@techreport{ietf-bess-srv6-services-01,
    number =    {draft-ietf-bess-srv6-services-01},
    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-bess-srv6-services/01/},
    author =    {Gaurav Dawra and Clarence Filsfils and Robert Raszuk and Bruno Decraene and Shunwan Zhuang and Jorge Rabadan},
    title =     {{SRv6 BGP based Overlay services}},
    pagetotal = 27,
    year =      ** No value found for 'doc.pub_date.year' **,
    month =     ** No value found for 'doc.pub_date' **,
    day =       ** No value found for 'doc.pub_date.day' **,
    abstract =  {This draft defines procedures and messages for SRv6-based BGP services including L3VPN, EVPN and Internet services. It builds on RFC4364 "BGP/MPLS IP Virtual Private Networks (VPNs)" and RFC7432 "BGP MPLS-Based Ethernet VPN".},
}