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Grants from the South African Council for Scientific and Industrial Research by way of the Topology Research Group at the University of Cape Town are acknowledged
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Cherenack, P. A two variable criterion for extrema with related effective procedure. Abh.Math.Semin.Univ.Hambg. 52, 1–15 (1982). https://doi.org/10.1007/BF02941862
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DOI: https://doi.org/10.1007/BF02941862