%0 Journal Article %A Coleman, A. J. %T Density Matrices of n-Fermion Systems %J Canadian mathematical bulletin %D 1961 %P 209-212 %V 4 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-023-7/ %R 10.4153/CMB-1961-023-7 %F 10_4153_CMB_1961_023_7