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Dedicated to Professor Takasi Nagahara on his 60th birthday
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Komatsu, H., Tominaga, H. Some Commutativity Theorems for Left s-Unital Rings. Results. Math. 15, 335–342 (1989). https://doi.org/10.1007/BF03322621
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DOI: https://doi.org/10.1007/BF03322621