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If it does not, download the PDF file from here [right (or ctrl-) click the link and 'save target as...']: Marion Wittchen, Daniel Schlereth & Guido Hertel: Social Indispensability in Spite of Temporal and Spatial Separation: Motivation Gains in a Sequential Task During Anonymous Cooperation on the Internet Use the back button to return to volume 2, issue 1, or visit the International Journal of Internet Science main page