%0 Journal Article %A Zaharopol, Radu %T On Products of Conditional Expectation Operators %J Canadian mathematical bulletin %D 1990 %P 257-260 %V 33 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1990-041-3/ %R 10.4153/CMB-1990-041-3 %F 10_4153_CMB_1990_041_3