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- [44] Fifteen years of the Burton process INDUSTRIAL AND ENGINEERING CHEMISTRY, 1928, 20 (01): : 1099 - 1101
- [47] The furan - Fifteen years of progress INDUSTRIAL AND ENGINEERING CHEMISTRY, 1936, 28 : 755 - 759
- [49] Past and the next fifteen years 1600, Royal Norwegian Council for Scientific & Indusustrial Resarch, Trondheim, Norw (15):