The cyclic subgroup separability of certain HNN extensions. Wong, P.C.; Wong, K.B. — 2006 Bulletin of the Malaysian Mathematical Sciences Society. Second Series
Subgroup separability and conjugacy separability of certain HNN extensions. Wong, P.C.; Wong, K.B. — 2008 Bulletin of the Malaysian Mathematical Sciences Society. Second Series
Maximum multiplicity of a root of the matching polynomial of a tree and minimum path cover. Ku, Cheng Yeaw; Wong, K.B. — 2009 The Electronic Journal of Combinatorics [electronic only]
On Chebyshev's polynomials and certain combinatorial identities. Lee, Chan-Lye; Wong, K.B. — 2011 Bulletin of the Malaysian Mathematical Sciences Society. Second Series