%0 Journal Article %A John, Kamil %T On a result of J. Johnson %J Czechoslovak Mathematical Journal %D 1995 %P 235-240 %V 45 %N 2 %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1995.128513/ %R 10.21136/CMJ.1995.128513 %G en %F 10_21136_CMJ_1995_128513