This knol is an authoritative article - Certification by Other Authors

http://knol.google.com/k/narayana-rao-kvss/this-knol-is-an-authoritative-article/2utb2lsm2k7a/267

In this knol authors can certify knols written by other authors as authoritative and comprehensive articles on the topic. This will help the visitors to have more trust in the knol.