%% You should probably cite rfc4381 instead of this I-D.
@techreport{behringer-mpls-security-10,
    number =    {draft-behringer-mpls-security-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-behringer-mpls-security/10/},
    author =    {Michael H. Behringer},
    title =     {{Analysis of the Security of BGP/MPLS IP Virtual Private Networks (VPNs)}},
    pagetotal = 22,
    year =      2004,
    month =     oct,
    day =       21,
    abstract =  {This document analyses the security of the BGP/MPLS IP virtual private network (VPN) architecture that is described in RFC 4364, for the benefit of service providers and VPN users. The analysis shows that BGP/MPLS IP VPN networks can be as secure as traditional layer-2 VPN services using Asynchronous Transfer Mode (ATM) or Frame Relay. This memo provides information for the Internet community.},
}