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Communicated by Klaus Keimel
This author gratefully acknowledges the support he received from the Alexander von Humboldt Foundation during the time he worked on this research project.
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Hofmann, K.H., Ruppert, W.A.F. Foliations induced by congruences. Semigroup Forum 38, 365–369 (1989). https://doi.org/10.1007/BF02573244
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DOI: https://doi.org/10.1007/BF02573244