1 Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, 47071 Valladolid, Spain. Electronic address: baladron@cpd.uva.es.
2 International Center for Mathematical Modeling in Physics and Cognitive Science, Mathematical Institute, Linnaeus University, S-35195 Växjö, Sweden National Research University of Information Technologies, Mechanics and Optics, St. Petersburg 197101, Russia.
3 Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan; Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage, Chiba 263-8522, Japan.