@article{li_an_ji_2015, title={Interpolating helicity spinors between the instant form and the light-front form}, volume={92}, DOI={10.1103/physrevd.92.105014}, number={10}, journal={Physical Review. D, Particles, Fields, Gravitation, and Cosmology}, author={Li, Z. Y. and An, M. and Ji, C. R.}, year={2015} }