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Keller, Stefan; Nigg, Claudio R.; Jäkle, Christian; Baum, Erika; Basler, Heinz-Dieter (1999). Self-efficacy, decisional balance and the stages of change for smoking cessation in a German sample. Swiss journal of psychology, 58(2), pp. 101-110. Huber 10.1024//1421-0185.58.2.101
