Finite Presentability of HNN Extensions of Inverse Semigroups. - Ersebet R. Dombi; Nick D. Gilbert; Nikola Ruskuc (Int. J. Algebra Comput., 2005)

Strongly F*-inverse covers for tiling semigroups. - Ersebet R. Dombi; Nick D. Gilbert (Period. Math. Hung., 2009)