Chahkandi Nejad, Hadi, Farshad, mohsen, Havangi, Ramazan. “Design of a New Observer for Unknown and Variable Input Time-Delay Estimation in Linear SISO Systems.” Nashriyyah -i Muhandisi -i Barq va Muhandisi -i Kampyutar -i Iran, vol. 18, no. 1, 2020, pp. 36-44.