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[2]
BUSH V, 1927, J FRANK I JAN, P63
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Bush V, 1929, OPERATIONAL CIRCUIT
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BUSH V, 1927, J FRANK I NOV, P575
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GOULD KE, 1928, J MATH PHYS, V3, P309
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HARDY, 1918, ACTA MATH, V41, P158
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HARDY AC, 1929, J O S A R S I, V18, P98
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An instrument densitometer for the measurement of high photographic densities
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KENRICK GW, 1927, NEW METHOD PERIODOGR