Ni, Fenbiao. 2000. ?Analysis And Reconstruction Of The Relationship Between A Circulation Anomaly Feature And Tree Rings: Linear And Nonlinear Approaches?. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=731915311&sid=23&Fmt=2&clientId=43922&RQT=309&VName=PQD.

Stage, Albert. 1968. ?Tree Ring Indices And Statistics?. Science. Science.