Chen S, Lee J, Doornenbal P, Obertelli A, Barbieri C, Chazono Y, Navrátil P, Ogata K, Otsuka T, Raimondi F, et al. Quasifree Neutron Knockout from Ca 54 Corroborates Arising N= 34 Neutron Magic Number. Physical Review Letters. 2019;123:142501.