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[2]
BIRKHOFF G., 1962, ORDINARY DIFFERENTIA
[5]
HOWARD H, 1960, T AM MATH SOC, V96, P296
[6]
Ince E., 1956, ORDINARY DIFFERENTIA
[7]
MARY DFS, 1969, J DIFFERENTIAL EQUAT, V5, P314
[8]
[No title captured]