Off-center reflections: caustics and chaos. Au, Thomas Kwok-keung; Lin, Xiao-Song — 2001 Experimental Mathematics
Finite type invariants of integral homology 3-spheres: A survey Xiao-Song Lin — 1998 Banach Center Publications
Knot polynomials and Vassiliev's invariants. Joan S. Birman; Xiao-Song Lin — 1993 Inventiones mathematicae