%0 Journal Article %T Dedication of the issue to Prof. František Šik and Prof. Miroslav Novotny, on the occasion of their seventieth birthdays %J Archivum mathematicum %D 1992 %P 1-2 %V 28 %N 1-2 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_1992__28_1-2_a0/ %G en %F ARM_1992__28_1-2_a0