%0 Journal Article %A Borwein, J. M. %A Théra, M. %T Sandwich Theorems for Semicontinuous Operators %J Canadian mathematical bulletin %D 1992 %P 463-474 %V 35 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1992-061-7/ %R 10.4153/CMB-1992-061-7 %F 10_4153_CMB_1992_061_7