An adaptive recursive array processing algorithm for resolving closely spaced signals with low SNR and widely disparate signal power. - Siew Kok Hui; B. L. Lim; Y. C. Lim (ICASSP, 1988)

Analysis of enhanced covariance matrix technique for source direction estimation in non-coherent and coherent signal environment. - B. L. Lim; Yong Ching Lim; Siew Kok Hui (ICASSP, 1990)