%0 Journal Article %A Hilbert Levitz %T On the Finsler and Doner-Tarski Arithmetical Hierarchies. %J Commentarii mathematici Helvetici %D 1969 %P 89-92 %V 44 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1969__44_139384/ %F CMH_1969__44_139384