Lower bounds of isoperimetric functions for nilpotent groups. - José Burillo (Geometric and Computational Perspectives on Infinite Groups, 1994)

Counting Primitive Elements in Free Groups. - José Burillo; Enric Ventura (Electron. Notes Discret. Math., 2001)

On Groups whose Geodesic Growth is Polynomial. - Martin R. Bridson; José Burillo; Murray Elder; Zoran Sunic (Int. J. Algebra Comput., 2012)

Metric properties of Baumslag-Solitar groups. - José Burillo; Murray Elder (Int. J. Algebra Comput., 2015)

Growth of positive words and lower bounds of the growth rate for Thompson's groups F(p). - José Burillo; Victor S. Guba (Int. J. Algebra Comput., 2017)