Performance and gain and phase margins of well-known PID tuning formulas. - Weng Khuen Ho; O. P. Gan; Ee Beng Tay; E. L. Ang (IEEE Trans. Control. Syst. Technol., 1996)

Fuzzy Regression Modeling for Tool Performance Prediction and Degradation Detection. - X. Li; Meng Joo Er; Beng Siong Lim; J. H. Zhou; O. P. Gan; Leszek Rutkowski (Int. J. Neural Syst., 2010)