Mathematisches Institut Universitaet Bonn, Germany

Institut de Mathématiques de Bourgogne, Département de Mathématiques, UFR Sciences et Techniques, Université de Bourgogne, France.; Department of Mathematics, Rikkyo University, Japan.

Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, Israel

Department of Mathematics and Computer Science, University of Catania, Italy; RUDN University, Russia

Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia

Department of Natural Sciences, The Open University of Israel, Raanana, Israel