Groups generated by two elliptic elements in PU(2,1)

et f and g be two elliptic elements in PU(2,1). We prove that if the distance δ(f,g) between the complex lines or points fixed by f and g is large than a certain number, then the group 〈f,g〉 is discrete non-elementary and isomorphic to the free product 〈f〉∗〈g〉.