Coherent states and related quantizations for unbounded motions / V. G. Bagrov, J.-P. Gazeau, D. M. Gitman, A. D. Levin // Journal of physics A: Mathematical and theoretical. 2012. Vol. 45, № 12. P. 125306 (1-14). URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000431625