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[2]
Jones H. A., 1927, GEN ELECTR REV, V30, P408
[3]
JONES HA, 1927, GEN ELECTR REV, V30, P319
[4]
JONES HA, 1927, GEN ELECTR REV, V30, P310
[5]
KING RW, 1923, BELL SYS TECH J, V2