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De Leeuw, E. D., 2001: Reducing Missing Data in Surveys: An Overview of Methods. Quality & Quantity 3: 147-10.
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De Leeuw, E.D., 2001: Reducing Missing Data in Surveys: An Overview of Methods, Quality & Quantity 35: 147-160.
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De Leeuw, E.D., 2001: Reducing Missing Data in Surveys: An Overview of Methods. Quality & Quantity 35: 147-160.
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de Leeuw, E. D. (2001). Reducing Missing Data in Surveys: An Overview of Methods. Quality & Quantity, 35(2), 147.
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