*Commutators in groups of piecewise projective homeomorphisms..*To appear in Advances in Mathematics. Joint with Y. Lodha and L. Reeves.*Metric properties and distortion in wreath products.*Submitted. Joint with E. López Platón.*Growth of positive words and lower bounds of the growth rate for Thompson's groups F(p).*Internat. J. Algebra Comput. 27 (2017), no. 1, 1-21. Joint with V. Guba.*Commensurations and metric properties of Houghton's groups.*Pacific J. Math. 285 (2016), no. 2, 289-301. Joint with S. Cleary, A. Martino and C. Röver.*The conjugacy problem in extensions of Thompson's group F.*Israel J. Math. 216 (2016), no. 1, 15-59. Joint with F. Matucci and E. Ventura.*Metric properties of Baumslag-Solitar groups.*Internat. J. Algebra Comput 25 (2015), no. 5, 799-811. Joint with M. Elder.*Conjugacy in Houghton's groups.*Publ. Mat. 59 (2015), no. 1, 3-16. Joint with Y. Antolín and A. Martino.*The automorphism group of Thompson's group F: subgroups and metric properties.*Rev. Mat. Iberoam. 29 (2013), no. 3, 809-828. Joint with S. Cleary.*Addendum to “Commensurations and subgroups of finite index of Thompson's group F”.*Geom. Topol. 17 (2013), 1199-1203. Joint with S. Cleary and C. Röver.*On groups whose geometric growth is polynomial.*Internat. J. Algebra Comput. 22 (2012), no. 5, 1250048, 13 pp. Joint with M. Bridson, M. Elder and Z. Sunić.*Metric properties of the higher-dimensional Thompson's group.*Pacific J. Math. 248 (2010), 49-62. Joint with S. Cleary.*Commensurations and finite-index subgroups of Thompson's group F.*Geom. Topol. 12 (2008), 1701-1709. Joint with S. Cleary and C. Röver.*Metric properties of the braided Thompson's groups.*Indiana Univ. Math. J. 58 (2009), 605-615. Joint with S. Cleary.*Combinatorial and metric properties of Thompson's group T.*Trans. Amer. Math. Soc. 361 (2009), 631-652. Joint with S. Cleary, M. Stein and J. Taback.*Biorderings on pure braided Thompson's groups.*Q. J. Math 59 (2008), 1-14. Joint with J. González-Meneses.*Pure braid subgroups of braided Thompson's groups.*Publ. Mat. 52 (2008), 57-89. Joint with T. Brady, S. Cleary and M. Stein.*Computational explorations in Thompson's group F.*, joint with S. Cleary and B. Wiest, In*Geometric Group Theory, proceedings from Geneva and Barcelona,*Birkhäuser, 2007*Quasi-potency and cyclic subgroup separability.*J. Algebra 208 (2006), 188-207. Joint with A. Martino.*Uniform non-amenability.*Adv. Math. 197 (2005), 499-522. Joint with G. Arzhantseva, M. Lustig, L. Reeves, H. Short and E. Ventura*Growth of positive words in Thompson's group F.*Comm. Algebra 32 (2004), 3087-3094.*Equivalence of combinatorial and geometric Dehn function.*New York J. Math. 8 (2002), 169-179. Joint with J. Taback.*Counting primitive elements in free groups.*Geom. Dedicata 93 (2002), 143--162. Joint with E. Ventura.*Crossing Matrices and Thurston's normal form for braids.*Topology Appl. 118 (2002), 293-308. Joint with M. Gutiérrez, S. Krstic and Z. Nitecki.*Metrics and embeddings of generalizations of Thompson's group F.*Trans. Amer. Math. Soc. 353 (2001), 1677-1689. Joint with S. Cleary and M. Stein.*Quasi-isometrically embedded subgroups of Thompson's group F.*J. Algebra 212 (1999), 65-78.*Dimension and fundamental groups of asymptotic cones.*J. London Math. Soc. (2) 59 (1999), 557-572.*Lower bounds for isoperimetric functions for nilpotent groups.*In*Geometric and Computational perspectives on infinite groups*(Minneapolis, MN and New Brunswick, NJ, 1994), 1-8, DIMACS Ser. Discrete Math. Theoret. Comput. Sci., 25, Amer. Math. Soc., Providence, RI, 1996.*El polinomio de PoincarĂ©-Hodge de un producto simétrico de variedades kählerianas compactas.*Collect. Math. 41 (1990), 59-69.