@misc{rfc2637,
    series =    {Request for Comments},
    number =    2637,
    howpublished =  {RFC 2637},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC2637},
    url =       {https://www.rfc-editor.org/info/rfc2637},
    author =    {Glen Zorn and Gurdeep-Singh Pall and Kory Hamzeh},
    title =     {{Point-to-Point Tunneling Protocol (PPTP)}},
    pagetotal = 57,
    year =      1999,
    month =     jul,
    abstract =  {This document specifies a protocol which allows the Point to Point Protocol (PPP) to be tunneled through an IP network. This memo provides information for the Internet community.},
}