%% You should probably cite draft-dong-teas-enhanced-vpn instead of this I-D.
@techreport{bryant-rtgwg-enhanced-vpn-00,
    number =    {draft-bryant-rtgwg-enhanced-vpn-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-bryant-rtgwg-enhanced-vpn/00/},
    author =    {Stewart Bryant and Jie Dong},
    title =     {{Enhanced Virtual Private Networks (VPN+)}},
    pagetotal = 10,
    year =      2017,
    month =     jul,
    day =       3,
    abstract =  {This draft describes a number of enhancements that need to be made to virtual private networks (VPNs) to support the needs of new applications, particularly applications that are associated with 5G services. A network enhanced with these properties may form the underpin of network slicing, but will also be of use in its own right.},
}