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Michael H. Graham, Confronting Multicollinearity in Ecological Multiple Regression, Ecology, Vol. 84, No. 11 (Nov., 2003), pp. 2809-2815 ...
Singularity in the Equation Systems of Econometrics: Some Aspects of the Problem of Multicollinearity L. R. Klein and Mitsugu Nakamura International Economic Review , pp. 274-299 (26 pages) ...
Multicollinearity: A phenomenon where independent variables in a regression model are highly correlated, potentially compromising the reliability of coefficient estimates.