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Classification of simply connected four-dimensional $RR$-manifolds
Tsagas, Gr., Ledger, A.Volume:
219
Year:
1976
Language:
english
Journal:
Transactions of the American Mathematical Society
DOI:
10.1090/s0002-9947-1976-0467603-0
File:
PDF, 1.42 MB
english, 1976