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To Professor L. Rédei on his 75th birthday
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Csákány, B. Varieties of modules and affine modules. Acta Mathematica Academiae Scientiarum Hungaricae 26, 263–266 (1975). https://doi.org/10.1007/BF01902330
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DOI: https://doi.org/10.1007/BF01902330