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Click to increase image sizeClick to decrease image size ∗This research was performed in the framework of the cooperation project Hopf algebras and (co) Galois theory ,supported by the Flemish and Romanian Ministries of Research. Notes ∗This research was performed in the framework of the cooperation project Hopf algebras and (co) Galois theory ,supported by the Flemish and Romanian Ministries of Research.
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Panaite et al. (1999) studied this question.
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