El Ahmad, Ahmad S and Yan, Jeff and Tayara, Mohamad. The Robustness of Google CAPTCHAs. Year 2011.
Toepfer, Martin and Kluegl, Peter and Hotho, Andreas and Puppe, Frank. Segmentation of References with Skip-Chain Conditional Random Fields for Consistent Label Transitions. Workshop Notes of the LWA 2011 - Learning, Knowledge, Adaptation. Year 2011.
Scholz, S.W. and Wagner, R.. Classification in Marketing Science. Cooperation in Classification and Data Analysis. editor(s) Okada, A. and Imaizumi, T. and Bock, H.-H. and Gaul, W.. 99 - 106, Springer, Berlin, Year 2009.
Baerveldt, T. A. B.. Influences on and from the segmentation of networks: hypotheses and tests. In Social Networks, (16) 213-232, Year 1994.