1. Department
of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada
2. Department
of Chemistry and Biochemistry, Queens College, City University of New York, Flushing, New York 11367, United States
3. Department
of Mathematics, Queens College, City University of New York, Flushing, New York 11367, United States
4. Department
of Mathematics and Statistics, University of Guelph, Guelph, Ontario N1G 2W1, Canada