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1Publicerad 1989“...Pergamon Press, in association with the Open University, Milton Keynes, England,...”
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2Publicerad 1991“...Pergamon Press, in association with the Open University, Walton Hall, Milton Keynes, England,...”
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3Publicerad 1989“...Pergamon Press, in association with the Open University, Walton Hall, Milton Keynes, England,...”
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