1. Assistant Professor, International School of Economics, Kazakh-British Technical Univ., 59 Tole bi St., Almaty 050000, Kazakhstan; formerly, Research Fellow, Dept. of Management and Production Engineering, Politecnico di Torino, 10129 Torino, Italy (corresponding author).
2. Assistant Professor, Dept. of Management and Production Engineering, Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy.