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Hiroshi KAWASAKI, Tadashi KATO, Soichiro IMADA, Hideaki MIWA, Tadashi YAMADA. "Low Pressure Koch Reaction by Cu(CO)n+-H2SO4-H3PO4-H2O Catalyst(Part 1). Low Pressure Koch Reaction of Isobutylene Oligomers." Journal of the Japan Petroleum Institute 37.3 (1994) 255-260