@article{MAT_1971_15_3_a3,
     author = {R. T. Powers and E. Stormer},
     title = {Free states of the canonical anticommutation relations},
     journal = {Matematika},
     pages = {60--90},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1971_15_3_a3/}
}