Generic Routing Encapsulation (GRE). - Stan Hanks; Tony Li; Dino Farinacci; Paul Traina (RFC, 1994)

Generic Routing Encapsulation over IPv4 networks. - Stan Hanks; Tony Li; Dino Farinacci; Paul Traina (RFC, 1994)

Generic Routing Encapsulation (GRE). - Dino Farinacci; Tony Li; Stan Hanks; David Meyer; Paul Traina (RFC, 2000)