1. Institute of Materials and Environmental Chemistry, Hungarian Research Network, Research Centre for Natural Sciences, Magyar tudósok körútja 2., Budapest H-1519, Hungary
2. Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4., H-1111 Budapest, Hungary
3. Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 2, D-52074 Aachen, Germany
4. Research Centre for Biochemical, Environmental and Chemical Engineering, Department of MOL Hydrocarbon and Coal Processing, University of Pannonia, Egyetem u. 10., Veszprém H-8210, Hungary