Operational resource measure of nonclassicality for number states filtered coherent states J. Merlin, E. Devibala and A. Basherrudin Mahmud Ahmed Eur. Phys. J. D, 76 3 (2022) 47 Published online: 14 March 2022 DOI: 10.1140/epjd/s10053-022-00372-z