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[11]
Hurewicz W., 1935, NEDERL AKAD WETENS A, VA38, P112
[12]
HUREWICZ W, 1936, NEDERL AKAD WETENS A, V39, P117
[13]
PITCHER E, 1950, B AM MATH SOC, V56
[17]
Whitehead J.H.C., 1941, ANN MATH, V42, P409
[18]
[No title captured]