%0 Journal Article %A Ronald Burthe %T Upper bounds for least witnesses and generating sets %J Acta Arithmetica %D 1997 %P 311-326 %V 80 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-80-4-311-326/ %R 10.4064/aa-80-4-311-326 %G en %F 10_4064_aa_80_4_311_326