On the non-existence of some generalized Hadamard matrices. - Charlie H. Cooke; Iem Heng (Australas. J Comb., 1999)

Using Solar Robotic Technology to Detect Lethal and Toxic Chemicals. - Iem Heng; Andy S. Zhang; Ali Harb (GHTC, 2011)

A Unique Environmental Mobile Device for Detecting Hazardous Chemicals. - Iem Heng; Andy S. Zhang; Michael Heimbinder; Raymond Yap (GHTC, 2012)