Sargis Gasparyan
ICRANet-Armenia, Marshall Baghramian Avenue 24a, Yerevan 0019, ArmeniaE- mail: sargisgyan {[at]} gmail.com
Damien Bégué
Department of Physics, Bar Ilan University, Ramat-Gan 52900, IsraelE-mail: cayley38 {[at]} gmail.com
Narek Sahakyan
ICRANet-Armenia, Marshall Baghramian Avenue 24a, Yerevan 0019, ArmeniaE-mail: narek {[at]} icra.it