Carlos Ríos-Ruiz Gloria-Lilia Osorio-Gordillo Harouna Souley Ali Mohamed Darouach Carlos-M. Astorga-Zaragoza Finite time functional observers for descriptor systems. Application to fault tolerant control. 165-170 2019 MED https://doi.org/10.1109/MED.2019.8798552 conf/med/2019 db/conf/med/med2019.html#Rios-RuizOADA19