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[2]
BRAY HE, 1923, B AM MATH SOC, V29, P264
[3]
LEVI E, 1909, ATTI REALE ACCADEMIA, V18, P10
[4]
TONELLI L, 1909, ATTI REALE ACAD LINC, V18, P577
[5]
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[6]
[No title captured]