William Allen Simpson. PPP Vendor Extensions. RFC, 2153:1-6, May 1997. [doi]
@article{rfc2153, title = {PPP Vendor Extensions}, author = {William Allen Simpson}, year = {1997}, month = {May}, doi = {10.17487/RFC2153}, url = {https://doi.org/10.17487/RFC2153}, researchr = {https://researchr.org/publication/rfc2153}, cites = {0}, citedby = {0}, journal = {RFC}, volume = {2153}, pages = {1-6}, }