Samiadji Herdjunanto. “Unknown Input Observer for Robust Fault Signal Detection Against Disturbances Using LMI”. Jurnal Nasional Teknik Elektro Dan Teknologi Informasi, vol. 7, no. 2, June 2018, pp. 197-03, https://jurnal.ugm.ac.id/v3/JNTETI/article/view/2771.