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This author gratefully acknowledges support received from the National Science Foundation (USA) under grant NSF-MPS 73-08937 A02
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Comfort, W.W., Itzkowitz, G.L. Density character in topological groups. Math. Ann. 226, 223–227 (1977). https://doi.org/10.1007/BF01362424
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DOI: https://doi.org/10.1007/BF01362424