State and unknown input estimation for a class of infinitely unobservable descriptor systems using two observers in cascade. - Jeremy Hor Teong Ooi; Chee Pin Tan; Wen-Shyan Chua; Xianghua Wang (J. Frankl. Inst., 2017)

A Sliding Mode Observer for Infinitely Unobservable Descriptor Systems. - Jeremy Hor Teong Ooi; Chee Pin Tan; Surya Girinatha Nurzaman; Kok Yew Ng (IEEE Trans. Autom. Control., 2017)

New results in robust fault reconstruction for a class of non-infinitely observable descriptor systems. - Joseph Chang Lun Chan; Chee Pin Tan; Jeremy Hor Teong Ooi; Hieu Trinh (ACC, 2019)