Финитная аппроксимируемость

[A] Wise, Daniel T. The residual finiteness of negatively curved polygons of finite groups.
    Invent. Math. 149, No.3, 579-617 (2002). [ISSN 0020-9910; ISSN 1432-1297]

[A] Hsu, Tim; Wise, Dani A non-residually finite square of finite groups.
    Campbell, C. M. (ed.) et al., Groups St. Andrews 1997 in Bath. Selected papers of the international conference, Bath, UK, July 26-August 9, 1997. Vol. 1. Cambridge: Cambridge University Press. Lond. Math. Soc. Lect. Note Ser. 260, 368-378 (1999). [ISBN 0-521-65588-9/pbk; ISSN 0076-0552]

[A] Kim, Goansu; Tang, C.Y. On the residual finiteness of polygonal products of nilpotent groups.
    Can. Math. Bull. 35, No.3, 390-399 (1992).

[A] Allenby, R.B.J.T.; Tang, C.Y. On the residual finiteness of certain polygonal products.
    Can. Math. Bull. 32, No.1, 11-17 (1989).

Аппроксимируемость относительно сопряженности

Kim, Goansu; Tang, C.Y. Separability properties of certain tree products of groups.
    J. Algebra 251, No.1, 323-349 (2002). [ISSN 0021-8693]

Kim, Goansu; Tang, C.Y. Separability properties of certain polygonal products of groups.
    J. Korean Math. Soc. 39, No.3, 461-494 (2002). [ISSN 0304-9914]

Wong, P.C.; Tang, C.K. Tree products of conjugacy separable groups.
    J. Algebra 222, No.2, 428-470, Art. No.jabr.1999.8011 (1999). [ISSN 0021-8693]

Raptis, E.; Talelli, O.; Varsos, D. On the conjugacy separability of certain graphs of groups.
    J. Algebra 199, No.1, 327-336, Art. No.JA977176 (1998). [ISSN 0021-8693]

[A]^* Wong, P.C.; Tang, C.K. Generalized free products of conjugacy-separable groups.
    Algebra Colloq. 5, No.2, 159-174 (1998). [ISSN 1005-3867]

[A] Kim, Goansu Conjugacy separability of certain polygonal products.
    Can. Math. Bull. 39, No.3, 294-307 (1996). [ISSN 0008-4395]

Kim, Goansu; Tang, C.Y. A criterion for the conjugacy separability of amalgamated free products of conjugacy separable groups.
    J. Algebra 184, No.3, 1052-1072, Art. No.0298 (1996). [ISSN 0021-8693]

Отделимость конечно порожденных подгрупп

[A]^* Kim, Goansu On polygonal products of finitely generated abelian groups.
    Bull. Aust. Math. Soc. 45, No.3, 453-462 (1992).

[A] Tretkoff, M. Covering spaces, subgroup separability, and the generalized M. Hall property.
    Combinatorial group theory, Proc. AMS Spec. Sess., College Park, MD, USA 1988, Contemp. Math. 109, 179-191 (1990).

Отделимость циклических подгрупп

[A] Allenby, R.B.J.T. Polygonal products of polycyclic by finite groups.
    Bull. Aust. Math. Soc. 54, No.3, 369-372 (1996). [ISSN 0004-9727]

[A]^* Kim, Goansu Cyclic subgroup separability of generalized free products.
    Can. Math. Bull. 36, No.3, 296-302 (1993).

[A]^* Kim, Goansu On polygonal products of finitely generated abelian groups.
    Bull. Aust. Math. Soc. 45, No.3, 453-462 (1992).

Нильпотентная аппроксимируемость

Varsos, D. The residual nilpotence of the fundamental group of certain graphs of groups.
    Houston J. Math. 22, No.2, 233-248 (1996). [ISSN 0362-1588]

[A] Allenby, R.B.J.T.; Tang, C.Y. On the residual finiteness of certain polygonal products.
    Can. Math. Bull. 32, No.1, 11-17 (1989).

Мощные группы

[A]^* Wong, P.C.; Tang, C.K. Tree products and polygonal products of weakly potent groups.
    Algebra Colloq. 5, No.1, 1-12 (1998). [ISSN 1005-3867]

[A]^* Wong, P.C.; Tang, C.K. Residual finiteness of generalized free products of isomorphic groups.
    Algebra Colloq. 4, No.2, 133-139 (1997). [ISSN 1005-3867]

^* Имеется печатный оттиск данной статьи