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Haveman, Robert and Krutilla, John (1966): Unemployment, Excess Capacity, and Benefit-Cost Investment Criteria. Published in: Review of Economics and Statistics , Vol. 3, No. 49 (1967): pp. 382-392.
Marris, R and Singh, Ajit (1966): A Measure of a Firm's Average Share Price. Published in: Journal of the Royal Statistical Society. Series A (General) , Vol. 129, No. 1 (1966): pp. 74-97.