%0 Journal Article %A Kalas, Josef %T On a “Liapunov like” function for an equation $\dot z=f(t,z)$ with a complex-valued function $f$ %J Archivum mathematicum %D 1982 %P 65-76 %V 18 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_1982__18_2_a1/ %G en %F ARM_1982__18_2_a1