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The author greatly acknowledges the support from the South African Council for Scientific and Industrial Research as well as the University of the Orange Free State and the University of Pretoria.
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le Roux, H.J., Heyman, G.A.P. & Jenkins, T.L. Essentially closed classes of rings and upper radicals. Acta Mathematica Academiae Scientiarum Hungaricae 38, 63–68 (1981). https://doi.org/10.1007/BF01917521
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DOI: https://doi.org/10.1007/BF01917521