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This research was partially supported by a National Science Foundation grant and by a Rutgers Research Council Faculty Fellowship.
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Nussbaum, R.D. On the uniqueness of the topological degree fork-set-contractions. Math Z 137, 1–6 (1974). https://doi.org/10.1007/BF01213930
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DOI: https://doi.org/10.1007/BF01213930