Tom Worster, Yakov Rekhter, Eric C. Rosen. Encapsulating MPLS in IP or Generic Routing Encapsulation (GRE). RFC, 4023:1-14, March 2005. [doi]
@article{rfc4023,
title = {Encapsulating MPLS in IP or Generic Routing Encapsulation (GRE)},
author = {Tom Worster and Yakov Rekhter and Eric C. Rosen},
year = {2005},
month = {March},
doi = {10.17487/RFC4023},
url = {https://doi.org/10.17487/RFC4023},
researchr = {https://researchr.org/publication/rfc4023},
cites = {0},
citedby = {0},
journal = {RFC},
volume = {4023},
pages = {1-14},
}