M. Parwoll, und R. Wagner. Challenges at the Interface of Data Analysis, Computer Science, and Optimization, Studies in Classification, Data Analysis, and Knowledge Organization, Seite 537-544. Berlin, Springer, (2012)
M. Parwoll, und R. Wagner. Aging Society and its Implications on Service Marketing Approaches in the Hospitality, Tourism and Transport, Bock, Bad Honnef, (2011)