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Fan, <i>et al<\/i>.: \u201cAn improved inertia disturbance suppression method for PMSM based on disturbance observer and two-degree-of-freedom PI controller,\u201d IEEE Trans. Power Electron. <b>38<\/b> (2023) 3590 (DOI: 10.1109\/tpel.2022.3218842).","DOI":"10.1109\/TPEL.2022.3218842"},{"key":"29","doi-asserted-by":"crossref","unstructured":"[29] A. Apte, <i>et al<\/i>.: \u201cDisturbance-observer-based sensorless control of PMSM using integral state feedback controller,\u201d IEEE Trans. Power Electron. <b>35<\/b> (2020) 6082 (DOI: 10.1109\/tpel.2019.2949921).","DOI":"10.1109\/TPEL.2019.2949921"},{"key":"30","doi-asserted-by":"crossref","unstructured":"[30] B. Xu, <i>et al<\/i>.: \u201cImproved non-singular fast terminal sliding mode control with disturbance observer for PMSM drives,\u201d IEEE Trans. Transport. 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