1. Department of Mathematics and Statistics, College of Physical and Engineering Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
2. Faculty of Science, University of Ontario Institute of Technology, Oshawa, Ontario L1H 7K4, Canada
3. Institute of Chemical Process Fundamentals, Czech Academy of Sciences, 165 02 Prague 6, Czech Republic and Department of Chemistry, Faculty of Science, J. E. Purkyně University, 400 96 Ústí nad Labem, Czech Republic