%0 Journal Article %A Hlaváček, Ivan %T Convergence of dual finite element approximations for unilateral boundary value problems %J Applications of Mathematics %D 1980 %P 375-386 %V 25 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/AM.1980.103872/ %R 10.21136/AM.1980.103872 %G en %F 10_21136_AM_1980_103872