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The authors  should be commended for their very interesting contribution. The paper is especially relevant because according to a U.S. Department of Commerce report  considering 245 countries around the world, it was found that 20% of them operate at 60 Hz, 75.17% operate at 50 Hz, and the remaining 4.82% operate at both 50 and 60 Hz. Transformers designed at 50 Hz work satisfactorily at 60 Hz, but the contrary is not true. Therefore, transformers for multicountry operation are designeddoi:10.1109/tpwrd.2003.817827 fatcat:ranqy3amvzewrocrjml2ff7mm4