%% You should probably cite rfc7077 instead of this I-D.
@techreport{ietf-netext-update-notifications-02,
    number =    {draft-ietf-netext-update-notifications-02},
    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-update-notifications/02/},
    author =    {Suresh Krishnan and Sri Gundavelli and Marco Liebsch and Hidetoshi Yokota and Jouni Korhonen},
    title =     {{Update Notifications for Proxy Mobile IPv6}},
    pagetotal = 15,
    year =      2013,
    month =     may,
    day =       3,
    abstract =  {This document specifies protocol enhancements for allowing the local mobility anchor in a Proxy Mobile IPv6 domain to asynchronously notify the mobile access gateway about changes related to a mobility session. These update notifications are exchanged using a Mobility Header message type specifically designed for this purpose.},
}