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[2] L. P. BELLUCE W. A. KIRK:
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[4] F. E. BROWDER:
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[8] J. DANEŠ: Generalized concentrative mappings. Summer School on Fixed Points, Krkonoše, Czechoslovakia, Aug. 31 - Sept. 6 1969.
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[13] W. A. KIRK:
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[15] B. N. SADOVSKII:
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