1. Department of Mathematics, Clarkson University, Potsdam, NY 13699 USA, and Clarkson Center for Complex Systems Science (C3S2), Potsdam, NY 13699, USA.
2. School of Mathematical Sciences, University of Adelaide, Adelaide SA 5005, Australia.
3. Department of Electrical and Computer Engineering, Clarkson University, Potsdam, NY 13699 USA, and Clarkson Center for Complex Systems Science (C3S2), Potsdam, NY 13699 USA.