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This work forms part of the author's Ph.D. thesis [12]. Most of the work was carried out while I was the holder of a Postgraduate Research Award and I am grateful for that financial support.
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Sonenberg, E.A. On the elementary theory of inductive order. Arch math Logik 19, 13–22 (1978). https://doi.org/10.1007/BF02011864
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DOI: https://doi.org/10.1007/BF02011864