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[3]
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[4]
HALL M, 1959, THEORY GROUPS
[5]
Hilton P. J., 1960, HOMOLOGY THEORY
[8]
STALLINGS JR, 1961, FIBERING CERTAIN 3MA
[9]
Whitehead JHC, 1939, P LOND MATH SOC, V45, P243
[10]
[No title captured]