%0 Journal Article %A L.J. Guibas %A Sharir Micha %A Shmuel Sifrony %T On the General Motion-Planning Problem with Two Degrees of Freedom. %J Discrete & computational geometry %D 1989 %P 491-522 %V 4 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DCG_1989__4_6_131093/ %F DCG_1989__4_6_131093