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- [4] HOMOTOPY INVARIANTS AND CONTINUOUS MAPPINGS PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1950, 202 (1069): : 253 - 263
- [9] REALIZATION OF HOMOTOPY CLASSES BY ALGEBRAIC MAPPINGS JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK, 1987, 377 : 159 - 169