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This work was done during a stay of the author at the Instituto de Matemáticas, UNAM supported by a grant from DAAD (Germany) and SRE (México).
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Geiss, C. On degenerations of tame and wild algebras. Arch. Math 64, 11–16 (1995). https://doi.org/10.1007/BF01193544
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DOI: https://doi.org/10.1007/BF01193544