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Christie, Herbert and Shutler, M. F. (1971) The marginal costs of coal. In: Turvey, Ralph and Christie, Herbert, (eds.) Economic Analysis and Public Enterprises. George Allen & Unwin Ltd, London, UK, pp. 133-139. ISBN 0043301843
Turvey, Ralph and Shutler, M. F. (1971) Cost analysis of natural gas supply. In: Turvey, Ralph and Christie, Herbert, (eds.) Economic Analysis and Public Enterprises. George Allen & Unwin Ltd, London, UK, pp. 98-111. ISBN 0043301843