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[2]
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[4]
LEVIN AJ, 1961, SOV MATH DOKL, V1, P1313
[5]
Moore R.A., 1955, PACIFIC J MATH, V5, P125
[8]
Wintner A., 1957, MATH SCAND, V5, P255
[9]
[No title captured]
[10]
[No title captured]