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Uncountable products of determined groups need not be determined (with S. Hernández and S. Macario). Journal of Mathematical Analysis and Applications 348 (2008) 834-842.  MR 2010a:22002. Zbl 1156.22002

Three questions in topological groups. In: Open Problems Collected from the Spring Topology and Dynamical Systems Conference 2006, edited by Jerry E. Vaughan, Topology Proceedings 31 (1) (2007), 393-395.

Two problems in topological groups. Talk given at the 40th Spring Topology and Dynamical Systems Conference, Greensboro, NC, March 23-25, 2006.

On Aumann's Theorem that the sphere does not admit a mean, (with Marian Turzanski), Acta Univ. Carolin. Math. Phys. 46 (2005), no. 2, 77--82. MR 2006h:26039.

Concerning the dual group of a dense subgroup (with W. W. Comfort, and S. U. Raczkowski), pp. 23-35, in: ``Proceedings of the Ninth Prague Topological Symposium" (2001). Posted at: http://at.yorku.ca/p/p/a/e/00.htm Zbl 1007.22005

 A characterization of Pontryagin-van Kampen duality for complex locally convex spaces (with F. G. Bonales and R. Vera M.), Communications in Algebra, 30 (4) (2002), pp. 1715-1724. MR 2002m:46002. Zbl 01749751

Some open questions on topological groups (with W. W. Comfort, S. Hernández, and D. Remus), pp. 57-76. In: Research and Exposition series, Vol 24, Heldermann Verlag Berlin. MR: 2002g:22003. Zbl 1014.22004

A characterization of Pontryagin-van Kampen duality for locally convex spaces (with F. G. Bonales and R. Vera M.), Topology and Applications, 121 (2002), pp. 75-89. MR: 2003c:46006. Zbl. 1017.46001

Duality of totally bounded Abelian groups (with S. U. Raczkowski), Boletín  de la Sociedad Matemática Mexicana, 3 (7) (2001), pp. 1-12. MR: 2002g:22006. Zbl 1007.22004

Cross sections and homeomorphism classes of abelian groups equipped with the Bohr topology (with W. W. Comfort, and S. Hernández), Topology Appl. 115 (2001), no. 2, 215--233.. MR: 2002i:22006. Zbl 0986.22001

 Relating a locally compact Abelian group to its Bohr compactification, (with W. W. Comfort and S. Hernández), Advances in Mathematics, 120 (2) (1996), 322-344. MR: 97k:22005, Zbl. 863.22004.

 Locally pseudocompact groups, (with W. W. Comfort), Topology and Applications, 62 (3) (1995), 263-281. MR: 96c 22002, Zbl. 828.22003.

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Normality and the weak topology on a locally compact Abelian group, Papers on General Topology and its Applications, Annals of the New York Academy of Sciences, 278 (1994), 290-295. MR: 98m:22004, Zbl. 914.22006.

Determining a weakly locally compact group topology by its system of closed subgroups, (with W. W. Comfort and T. Soundararajan), Papers on General Topology and its Applications, Annals of the New York Academy of Sciences, 728 (1994), 248-261. MR: 99d:22002, Zbl. 921.22001.

Abelian Groups which Satisfy Pontryagin Duality need not Respect Compactness (with Dieter Remus), Proceedings of the American Mathematical Society, 117 (1993) (4), pp. 1195-1200. MR: 93e:22002, Zbl. 826.22002.

The Bohr compactification, modulo a metrizable subgroup,     (with W.~W. Comfort and T.-S. Wu), Fund. Math. 143 (1993), 119--136. MR: 94i 22013, Zbl. 812 22001. Correction, Fund. Math. 152 (1997), 97-98. MR: 98b:22005, Zbl. 872.22001.

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Continuity, boundedness, connectedness and the Lindelöf property for topological groups, J. Pure and Applied Algebra, 70 (1991), 199--210. MR: 92h 22009, Zbl. 724:22003.

Pseudocompactness on groups, ``General Topology and Applications; Fifth Northeast Conference". Marcel Dekker, New York--Basel--Hong Kong (1991), 369--378. MR: 93c 22005, Zbl. 777.22003.

Remarks on a theorem of Glicksberg, (with W. W. Comfort), “General Topology and Applications; Fifth Northeast Conference". Marcel Dekker, New York--Basel--Hong Kong (1991), 25--34. MR:92k 54042, Zbl. 777.22002.