Google PageRank : an analysis

An interesting paper : Inside PageRank, by prof. Marco Gori and associates from University of Sienna, Italy.
http://portal.acm.org/ft_gateway.cfm?id=1052938&type=pdf
The paper proposes an linear-system-type analysis of the sistem.
The page rank,as proposed by Page and Brin is based on the recursive equiation
of the form : PageRank(node) = Sum(page ranks of the parents)*weght function + constant
Though the system cannot be directly solved, one can prove the stability of the system.
... to be edited....