1. State and unknown input estimation for a class of infinitely unobservable descriptor systems using two observers in cascade. Issue 18 (December 2017) Authors: Ooi, Jeremy H.T.; Tan, Chee Pin; Chua, Wen-Shyan; Wang, Xianghua Journal: Journal of the Franklin Institute Issue: Volume 354:Issue 18(2017) Page Start: 8374 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗