@article{DAN_1957_113_6_a16,
     author = {G. A. Zaitsev},
     title = {On the fundamental relativistically invariant equation for a particle with spin $1/2$},
     journal = {Doklady Akademii Nauk},
     pages = {1248--1250},
     publisher = {mathdoc},
     volume = {113},
     number = {6},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_6_a16/}
}