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@unpublished{TUW-214743,
    author = {Schmidt, Manuela and Klettner, Silvia and Steinmann, Renate and H{\"a}usler, Elisabeth},
    title = {The Impact of the Contributor in VGI Projects},
    year = {2012},
    keywords = {OpenStreetMap, Volunteered Geographic Information},
    note = {talk: Workshop on Map Creation From User Generated Data, Hannover; 2012-10-08}
}