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![Cover for Konstantin Wellner · User Innovators in the Silver Market: An Empirical Study among Camping Tourists - Forschungs- / Entwicklungs- / Innovations-Management (Paperback Book) [2015 edition] (2015)](https://imusic.b-cdn.net/images/item/original/432/9783658090432.jpg?konstantin-wellner-2015-user-innovators-in-the-silver-market-an-empirical-study-among-camping-tourists-forschungs-entwicklungs-innovations-management-paperback-book&class=scaled&v=1498732023)