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The paper was written while the author was visiting the Bielefeld University. He was supported by Deutsche Forschungsgemeinschaft and Alexander von Humboldt-Stiftung.
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Skowroński, A. Generalization of Yamagata's theorem on trivial extensions. Arch. Math 48, 68–76 (1987). https://doi.org/10.1007/BF01196357
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DOI: https://doi.org/10.1007/BF01196357