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[1]
[Anonymous], 1934, PROC MATH PHYS ENG S, DOI DOI 10.1098/RSPA.1934.0132
[2]
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Williams E., 1935, P R SOC LONDON, V152, P231, DOI [DOI 10.1098/RSPA.1935.0188, 10.1098/rspa.1935.0188]