Stochastic resonance in a harmonic oscillator subject to random mass and periodically modulated noise Wang-Hao Dai, Rui-Bin Ren, Mao-Kang Luo and Ke Deng Eur. Phys. J. B, 91 2 (2018) 26 Published online: 07 February 2018 DOI: 10.1140/epjb/e2017-80165-9