Enhancing entanglement of entangled coherent states via a f-deformed photon-addition operationB. Mojaveri, A. Dehghani and R. Jafarzadeh BahrbeigEur. Phys. J. Plus, 134 9 (2019) 456DOI: https://doi.org/10.1140/epjp/i2019-12823-7