Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Ekong Ufot Ufot and Inamori Mamiko and Morimoto Masayuki,Field-Weakening Control for Torque and Efficiency Optimization of a Four-Switch Three-Phase Inverter-Fed Induction Motor Drive,IEEJ Journal of Industry Applications,21871094,The Institute of Electrical Engineers of Japan,2019-05-01,8,3,548-555,https://cir.nii.ac.jp/crid/1390282763112213248,https://doi.org/10.1541/ieejjia.8.548