Affiliation: | Department of Applied Mathematics, Israel Institute for Biological Research, P.O.B 19 Nes-Ziona 74100, Israel; Department of Physics and Astronomy, The University of Georgia, Athens GA 30602-2451, USA; Department of Physics, Ben-Gurion University Beer-Sheba, 84105, Israel; Department of Physics and Astronomy, University of Oklahoma, Norman OK 73019-0225, USA |