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The first author gratefully acknowledges the support given by the Hungarian Government and the National Research Council of Canada.
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Anderson, T., Wiegandt, R. Weakly homomorphically closed semisimple classes. Acta Mathematica Academiae Scientiarum Hungaricae 34, 329–336 (1979). https://doi.org/10.1007/BF01896128
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DOI: https://doi.org/10.1007/BF01896128