%% You should probably cite rfc8086 instead of this I-D.
@techreport{ietf-tsvwg-gre-in-udp-encap-16,
    number =    {draft-ietf-tsvwg-gre-in-udp-encap-16},
    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/16/},
    author =    {Lucy Yong and Edward Crabbe and Xiaohu Xu and Tom Herbert},
    title =     {{GRE-in-UDP Encapsulation}},
    pagetotal = 24,
    year =      2016,
    month =     jul,
    day =       18,
    abstract =  {This document specifies a method of encapsulating network protocol packet within GRE and UDP headers. This GRE-in-UDP encapsulation allows the UDP source port field to be used as an entropy field. This may be used for load balancing of GRE traffic in transit networks using existing ECMP mechanisms. This document also specifies GRE-in-UDP tunnel requirements for two applicability scenarios: (1) general Internet; (2) a traffic-managed controlled environment. The controlled environment has less restrictive requirements than the general Internet.},
}