%0 Journal Article %A Phillips, N. Christopher %T Every Invertible Hilbert Space Operator is a Product of Seven Positive Operators %J Canadian mathematical bulletin %D 1995 %P 230-236 %V 38 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1995-033-9/ %R 10.4153/CMB-1995-033-9 %F 10_4153_CMB_1995_033_9