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Hunter, R., Richman, F., Walker, E. (1977). Warfield modules. In: Arnold, D.M., Hunter, R.H., Walker, E.A. (eds) Abelian Group Theory. Lecture Notes in Mathematics, vol 616. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0068191
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DOI: https://doi.org/10.1007/BFb0068191
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