%0 Journal Article %A Headley, V.B. %T Comparison Theorems for Linear Elliptic Equations %J Canadian mathematical bulletin %D 1993 %P 164-172 %V 36 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1993-024-9/ %R 10.4153/CMB-1993-024-9 %F 10_4153_CMB_1993_024_9