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[1]
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[2]
GELFOND AO, 1951, CALCULUS FINITE DIFF
[3]
Kaz'min Yu. A., 1972, MAT ZAMETKI, V11, P353
[4]
KAZMIN YA, 1967, VESTN MOSK U MM, P3
[5]
KAZMIN YA, 1972, THESIS MOSCOW STATE