Unoccupied topological surface state in Bi2Te2Se / M. Nurmamat, E. E. Krasovskii, K. A. Kokh [et.al.] // Physical Review B. 2013. Vol. 88, № 8. P. 081301-1-081301-5. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000465292