Eric C. Rosen. Removing a Restriction on the use of MPLS Explicit NULL. RFC, 4182:1-7, September 2005. [doi]
@article{rfc4182, title = {Removing a Restriction on the use of MPLS Explicit NULL}, author = {Eric C. Rosen}, year = {2005}, month = {September}, doi = {10.17487/RFC4182}, url = {https://doi.org/10.17487/RFC4182}, researchr = {https://researchr.org/publication/rfc4182}, cites = {0}, citedby = {0}, journal = {RFC}, volume = {4182}, pages = {1-7}, }