%0 Journal Article %A Tůma, Miroslav %T A note on direct methods for approximations of sparse Hessian matrices %J Applications of Mathematics %D 1988 %P 171-176 %V 33 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/AM.1988.104300/ %R 10.21136/AM.1988.104300 %G en %F 10_21136_AM_1988_104300