%0 Journal Article %A Janina Chodukowska %A Zbigniew Marciniak %T On solutions of functional equations determining subsemigroups of $L^1_4$ %J Colloquium Mathematicum %D 2010 %P 181-192 %V 119 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm119-2-2/ %R 10.4064/cm119-2-2 %G en %F 10_4064_cm119_2_2