Walters LC, CC Gary, WS David and G Charles (1994). “Measuring Obsolescence in Regulated Firms: Enhancements to the Cost Approach.” Assessment Journal 1(3): 47-58.

Walters LC, CC Gary, WS David and G Charles (1994). “Measuring Obsolescence in Regulated Firms: Enhancements to the Cost Approach.” Assessment Journal 1(3): 47-58.

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