Free Symmetric and Unitary Pairs in Division Rings with Involution. - Vitor O. Ferreira; Jairo Z. Gonçalves; Arnaldo Mandel (Int. J. Algebra Comput., 2005)

Bass Cyclic Units as Factors in a Free Group in Integral Group Ring Units. - Jairo Z. Gonçalves; Ángel del Río (Int. J. Algebra Comput., 2011)

Free Group Algebras in Division Rings. - Jairo Z. Gonçalves; Eduardo Tengan (Int. J. Algebra Comput., 2012)

Free subgroups in division rings generated by group rings of soluble groups. - Jairo Z. Gonçalves; A. I. Lichtman (Int. J. Algebra Comput., 2014)

Free symmetric algebras in division rings generated by enveloping algebras of Lie algebras. - Vitor O. Ferreira; Jairo Z. Gonçalves; Javier Sánchez 002 (Int. J. Algebra Comput., 2015)