Sooyoung Cho, Hanwoong Ahn, Sang-Hwan Ham, Chang-Sung Jin, Sung Gu Lee, and Ju Lee,
                           “Design of Fan-shape Type PMSM for Improving Efficiency of Non-rare Earth Motor,”
                           The transactions of The Korean Institute of Electrical Engineers, vol. 65, no. 2,
                           pp. 360-364, 2016.DOI:10.5370/KIEE.2016.65.2.36
