%0 Journal Article %A Brandts, Jan H. %T Superconvergence of mixed finite element semi-discretizations of two time-dependent problems %J Applications of Mathematics %D 1999 %P 43-53 %V 44 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1023/A:1022220219953/ %R 10.1023/A:1022220219953 %G en %F 10_1023_A_1022220219953