1. Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Leoben, Austria
2. Institute of Physics, Montanuniversität Leoben, Leoben, Austria
3. Christian Doppler Laboratory for Surface Chemical and Physical Fundamentals of Paper Strength, Graz University of Technology, Graz, Austria
4. Industrial Liaison Department, Montanuniversität Leoben, Leoben, Austria