A note on the q-ary image of a qm-ary repeated-root cyclic code. - Li-Zhong Tang; Cheong Boon Soh; Erry Gunawan (IEEE Trans. Inf. Theory, 1997)

Groups of Algebraic Integers Used for Coding QAM Signals. - Xue-Dong Dong; Cheong Boon Soh; Erry Gunawan; Li-Zhong Tang (IEEE Trans. Inf. Theory, 1998)

On Groups of Complex Integers Used as QAM Signals. - Xue-Dong Dong; Cheong Boon Soh; Erry Gunawan; Li-Zhong Tang (Inf. Sci., 1999)