[1] Faculty of Applied Sciences, University POLITEHNICA of Bucharest, Romania
[2] Department of Engineering, Swiss Federal Institute of Technology, EPFL, Lausanne, Switzerland
[3] Computer Science and Systems Engineering Department, Ecole Nationale Superiore de Techniques Avancées (ENSTA), ParisTech, Paris, France
[4] Physics Department, Faculty of Applied Sciences, University POLITEHNICA of Bucharest, Romania