1. MTA Centre for Energy Research, POB 49, H-1525 Budapest, Hungary
2. Department of Energy Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, D208, H-1111 Budapest, Hungary
3. Departamento de
Reología,
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, 04510, México D.F., México
4. Institute of Physical Chemistry, University of Cologne, Luxemburger Straße 116, D-50939 Köln, Germany