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Helm, Roland and Landschulze, Sebastian (2013) How does consumer age affect the desire for new products and brands? A multi-group causal analysis. Review of Managerial Science Vol. 7 (No. 1), pp. 29-59.
Helm, Roland and Landschulze, Sebastian (2009) Optimal stimulation level theory, exploratory consumer behaviour and product adoption: an analysis of underlying structures across product categories. Review of managerial science 3 (1), pp. 41-73.
Helm, Roland and Landschulze, Sebastian (2007) Von der Urne zum Pilz - Produkt- und marktstrategische Optionen. Marketing-Journal 440 (6), pp. 38-43.