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Nigg, C.R.; Maddock, J.E.; Barnett, J.D.; Marshall, C.S. (2004). Considering Using the Stages of Change for Surveillance? In: Keller, S.; Velicer, W. F. (eds.) Research on the Transtheoretical Model: Where are we now, where are we going? (pp. 87-88). Lengerich, Germany: Pabst Science Publishers
