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              Pedersen, S. (2003). The Shadow Economy in Germany, Great Britain and Scandinavia: A Measurement Based on Questionnaire Surveys. Copenhagen: The Rockwool Foundation Research Unit.
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              Pedersen, S. (2003). The shadow economy in Germany, Great Britain and Scandinavia: A measurement based on questionnaire surveys. Copenhagen: The Rockwool Foundation Research Unit.
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              Pedersen, Søren (2003), The Shadow Economy in Germany, Great Britain and Scandinavia: A Measurement Based on Questionnaire Surveys, The Rockwool Foundation Research Unit, Kopenhagen, Study No. 10.
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