%% You should probably cite rfc6909 instead of this I-D.
@techreport{ietf-netext-pmipv6-sipto-option-08,
    number =    {draft-ietf-netext-pmipv6-sipto-option-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-netext-pmipv6-sipto-option/08/},
    author =    {Sri Gundavelli and Xingyue Zhou and Jouni Korhonen and Rajeev Koodli},
    title =     {{IPv4 Traffic Offload Selector Option for Proxy Mobile IPv6}},
    pagetotal = 15,
    year =      2013,
    month =     jan,
    day =       10,
    abstract =  {This specification defines a traffic offload mechanism and a related mobility option for carrying IPv4 Offload traffic selectors between a mobile access gateway and a local mobility anchor in a Proxy Mobile IPv6 domain. Based on the negotiated IPv4 traffic offload flow selectors with the local mobility anchor, a mobile access gateway can enable offload traffic rule on the selected IPv4 flows.},
}