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Gordon, Roger, Schankerman, Mark ORCID: 0009-0006-1071-7672 and Spady, Richard (1986) Estimating the effects of r&d on Bell system productivity: a model of embodied technical change. In: Peston, M. H. and Quandt, R. E., (eds.) Prices, Competition and Equilibrium. Philip Allan, Deddington, UK, pp. 164-190. ISBN 0389206261