%% You should probably cite rfc8086 instead of this I-D.
@techreport{ietf-tsvwg-gre-in-udp-encap-08,
    number =    {draft-ietf-tsvwg-gre-in-udp-encap-08},
    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-tsvwg-gre-in-udp-encap/08/},
    author =    {Edward Crabbe and Lucy Yong and Xiaohu Xu and Tom Herbert},
    title =     {{GRE-in-UDP Encapsulation}},
    pagetotal = 25,
    year =      2015,
    month =     oct,
    day =       16,
    abstract =  {This document describes a method of encapsulating network protocol packets within GRE and UDP headers. In this encapsulation, the source UDP port can be used as an entropy field for purposes of load balancing, while the protocol of the encapsulated packet in the GRE payload is identified by the GRE Protocol Type. This encapsulation protocol can apply to IPv4 and IPv6 networks including the Internet. When applying it to a well-managed operator network, the tunnel implementation and usage can be less restrictive. The document specifies the tunnel implementations under both network scenarios.},
}