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Benabdallah, K., Mutzbauer, O. (1981). On direct decompositions of torsion free abelian groups of rank 4. In: Göbel, R., Walker, E. (eds) Abelian Group Theory. Lecture Notes in Mathematics, vol 874. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0090524
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DOI: https://doi.org/10.1007/BFb0090524
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