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Wong, P.C. and Tang, C.K. and Gan, H.W. (2010) Weak potency of fundamental groups of graphs of groups. Bulletin of the Malaysian Mathematical Sciences Society, 33 (2). pp. 243-251.
Wong, Peng Choon and Tang, C.K. (2000) Conjugacy Separability of Certain HNN Extensions of Conjugacy-Separable Groups. Algebra Colloquium, 7 (2). pp. 147-158. ISSN 1005-3867, DOI https://doi.org/10.1007/s10011-000-0147-5.
Wong, P.C. and Tang, C.K. (1999) Cyclic Subgroup Separability of Certain HNN Extensions of Finitely Generated Abelian Groups. Rocky Mountain Journal of Mathematics, 29 (1). pp. 347-356. ISSN 0035-7596, DOI https://doi.org/10.1216/rmjm/1181071695.