1. HAS Centre for Energy Research, H-1525 POB 49, Budapest, Hungary
2. Department of Energy Engineering, Budapest University of Technology and Economics, Müegyetem rkp. 3, D208, H-1111 Budapest, Hungary
3. Biological Sciences, College of Science, Swansea University, Singleton Park Swansea SA2 8PP, UK
4. Stiftung Tierärztliche Hochschule Hannover, Institut für Terrestrische und Aquatische Wildtierforschung, Werftstr. 6, 25761 Büsum, Germany