1. Department of Computer Science, Ben-Gurion University of the Negev; Department of Physics, Nuclear Research Center-Negev, Be'er-Sheva, Israel
2. Department of Mathematics and Computer Science, The Open University of Israel, Ra'anana, Israel
3. Department of Mathematics and Computer Science, The Open University of Israel; Department of Physics, Nuclear Research Center-Negev, Be'er-Sheva, Israel