%% You should probably cite rfc7563 instead of this I-D.
@techreport{ietf-netext-ani-location-09,
    number =    {draft-ietf-netext-ani-location-09},
    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-ani-location/09/},
    author =    {Rajesh Pazhyannur and Sebastian Speicher and Sri Gundavelli and Jouni Korhonen and John Kaippallimalil},
    title =     {{Extensions to the Proxy Mobile IPv6 (PMIPv6) Access Network Identifier Option}},
    pagetotal = 12,
    year =      2015,
    month =     mar,
    day =       23,
    abstract =  {The Access Network Identifier (ANI) mobility option was introduced in RFC 6757, "Access Network Identifier (ANI) Option for Proxy Mobile IPv6". This enables a Mobile Access Gateway (MAG) to convey identifiers like the network identifier, geolocation, and operator identifier. This specification extends the Access Network Identifier mobility option with sub-options to carry the civic location and the MAG group identifier. This specification also defines an ANI Update-Timer sub-option that determines when and how often the ANI option will be updated.},
}