(with Dennis Sullivan) String Topology in Dimensions Two and Three, to appear in the Abel Proceedings, 2007

(with Anthony Phillips) Self-intersection numbers of curves on the punctured torus , to appear in Experimental Mathematics.

(with Fabiana Krongold) An algebraic characterization of simple closed curves on surfaces with boundary in Math Archives 

Minimal intersection of curves on surfaces (preprint), to appear in Geometriae Dedicata.

Combinatorial Lie Bialgebras of  Curves on Surfaces. Topology 43 (2004), no3, 543--568. An improved version can be found here

(with Dennis Sullivan) Closed string operators in topology leading to Lie bialgebras and higher string algebra. The legacy of Niels Henrik Abel, 771-788, Springer, Verlin, 2004

(with Dennis Sullivan) String Topology (too appear in Annals of Mathematics)

(with Lluis Alsedaﾠ and Francesc Manosas) Rotation sets for orbits of degree one circle maps. Internat. J. Bifur. Chaos Appl. Sci. Engrg. 12 (2002), no. 2, 429--437

(with Lluis Alseda  and Jaroslav Smital),  On the structure of the Omega-limit sets for continuous maps of the interval. Discrete dynamical systems. Internat. J. Bifur. Chaos Appl. Sci. Engrg. 9 (1999), no. 9, 1719--1729

PhD Thesis, Minimum periods of homeomorphisms of orientable surfaces. (I've been planing to submit it for publication since 1998,  and I still did not loose hope)