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Märki, Anita; Bauer, Georg F.; Nigg, Claudio R.; Conca-Zeller, Antoinette; Gehring, Thomas M. (2006). Transtheoretical Model-based exercise counselling for older adults in Switzerland: quantitative results over a 1-year period. Sozial- und Präventivmedizin, 51(5), pp. 273-280. Birkhäuser 10.1007/s00038-006-5065-y
