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This research was partially supported by the National Research Council of Canada Grant A 8518. The author wishes to thank the referee for his valuable suggestions.
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Wong, C.S. A fixed point theorem for a class of mappings. Math. Ann. 204, 97–103 (1973). https://doi.org/10.1007/BF01433408
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DOI: https://doi.org/10.1007/BF01433408