Excitations of photon-number states in Kerr nonlinear resonator at finite temperatures Gor H. Hovsepyan and Gagik Yu. Kryuchkyan Eur. Phys. J. D, 69 3 (2015) 64 Published online: 06 March 2015 DOI: 10.1140/epjd/e2015-50738-y