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Partially supported by D.G.I.C.Y.T. grant BE91-031
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Banaszczyk, W., Chasco, M.J. & Martin-Peinador, E. Open subgroups and Pontryagin duality. Math Z 215, 195–204 (1994). https://doi.org/10.1007/BF02571709
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DOI: https://doi.org/10.1007/BF02571709