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[2]
Dolzenko E.P., 1967, IZV AKAD NAUK SSSR M, V31, P3
[3]
KELINDOS IA, 1966, MICHIGAN MATH J, V13, P235
[4]
PEED TI, 1969, PACIFIC J MATH, V28, P653
[5]
[No title captured]