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- [4] DETERMINATION OF ISOTOPY GROUP OF CERTAIN CONTRACTIBLE OPEN 3-MANIFOLDS - PRELIMINARY REPORT NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1974, 21 (01): : A227 - A227
- [7] IMBEDDING + ISOTOPY OF SPHERES IN MANIFOLDS PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY, 1964, 60 (03): : 433 - &