%0 Journal Article %A M.J. Wicks %T The Symmetries of Classes of Elements in a Free Group of Rank Two. %J Mathematische Annalen %D 1974 %P 21-44 %V 212 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1974__212_182731/ %F MAN_1974__212_182731