@article{10_4153_CMB_1961_023_7,
     author = {Coleman, A. J.},
     title = {Density {Matrices} of {n-Fermion} {Systems}},
     journal = {Canadian mathematical bulletin},
     pages = {209--212},
     year = {1961},
     volume = {4},
     number = {2},
     doi = {10.4153/CMB-1961-023-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-023-7/}
}