\input zb-basic \input zb-matheduc \iteman{ZMATH 2007b.00426} \itemau{Wills, Rebecca S.} \itemti{Google's PageRank.} \itemso{Math. Intell. 28, No. 4, 6-11 (2006).} \itemab Summary: The article describes the math behind the Google search machine. It has to do with directed graphs and PageRank as a special ranking algorithm. \itemrv{~} \itemcc{K35 R50 M50} \itemut{directed graph; ranking algorithm; search machine; information retrieval; mathematical applications} \itemli{doi:10.1007/BF02984696} \end