William Allen Simpson. PPP Link Quality Monitoring. RFC, 1333:1-17, May 1992. [doi]
@article{rfc1333, title = {PPP Link Quality Monitoring}, author = {William Allen Simpson}, year = {1992}, month = {May}, doi = {10.17487/RFC1333}, url = {https://doi.org/10.17487/RFC1333}, researchr = {https://researchr.org/publication/rfc1333}, cites = {0}, citedby = {0}, journal = {RFC}, volume = {1333}, pages = {1-17}, }