Technical University of Ilmenau, Faculty of Business Administration, Department of Business Related Computer Science I, PF 10 05 65, Helmholzplatz 3, 98684 Ilmenau, GERMANY;Technical University of Ilmenau, Faculty of Business Administration, Department of Business Related Computer Science I, PF 10 05 65, Helmholzplatz 3, 98684 Ilmenau, GERMANY;Technical University of Ilmenau, Faculty of Business Administration, Department of Business Related Computer Science I, PF 10 05 65, Helmholzplatz 3, 98684 Ilmenau, GERMANY