%0 Journal Article %A Johnston, Elgin H. %T An extension of a theorem of Abian %J Archivum mathematicum %D 1982 %P 15-18 %V 18 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_1982__18_1_a2/ %G en %F ARM_1982__18_1_a2