A short proof of non Gromov-hyperbolicity of Teichmüller spaces,
Ann. Acad. Sci. Fenn. Math., V. 27, No. 1 (2002), 3–5.
Examples of large centralizers in the Artin braid groups, Geom. Dedicata, V. 105, No. 1 (2004), 231–235.
(with B. Farb) The Torelli geometry and its applications,
The Mathematical Research Letters, V. 12, No. 3 (2005), 293–301.
A differential forms perspective on the Lax proof of the change of variables formula,
The American Mathematical Monthly, V. 112, No. 10 (2005), 799–806.
Fifteen problems about the mapping class groups,
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