4–manifolds as covers of the 4–sphere branched over non-singular surfaces
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1987 ◽
Vol 25
(9)
◽
pp. 1155-1163
◽
1993 ◽
Vol 11
(2)
◽
pp. 125-133
◽
1975 ◽
pp. 449-521
◽
Keyword(s):