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- [22] FIXED-POINT INDEX AND NIELSEN FIXED-POINT THEOREM OF SYMMETRIC PRODUCT MAPPINGS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1973, 20 (06): : A594 - A594
- [28] DEGENERACY, NON-EJECTIVE FIXED-POINTS AND THE FIXED-POINT INDEX JOURNAL DE MATHEMATIQUES PURES ET APPLIQUEES, 1979, 58 (02): : 217 - 228