Devil’s staircases in a thermoacoustic system with sinusoidal excitations Zhengyuan Zhang, Jiazhong Zhang, Pengyu Fan and Yongsen He Eur. Phys. J. Special Topics, 228 9 (2019) 1891-1901 Published online: 25 September 2019 DOI: 10.1140/epjst/e2019-800226-7