Residual Finiteness of Outer Automorphism Groups of Finitely Generated Non-Triangle Fuchsian Groups. - Reginald B. J. T. Allenby; Goansu Kim; C. Y. Tang (Int. J. Algebra Comput., 2005)

Abelian subgroup separability of certain HNN extensions. - Wei Zhou; Goansu Kim (Int. J. Algebra Comput., 2018)