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- [21] Carbon black in rubber insulating compounds INDUSTRIAL AND ENGINEERING CHEMISTRY, 1930, 22 : 1258 - 1259
- [22] Carbon black in rubber insulating compounds INDUSTRIAL AND ENGINEERING CHEMISTRY, 1930, 22 : 822 - 826
- [23] Carbon black in rubber insulating compounds INDUSTRIAL AND ENGINEERING CHEMISTRY, 1930, 22 : 1259 - 1260