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[2]
ANTMAN S, TO BE PUBLISHED
[4]
Jackson S. B., 1944, B AM MATH SOC, V50, P564
[5]
Keller JB., 1969, BIFURCATION THEORY N
[6]
Krasnosel'skii M., 1964, TOPOLOGICAL METHODS
[8]
Tadjbakhsh I., 1966, INT J ENG SCI, V4, P433
[9]
[No title captured]