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Takanobu KAWAI, Shoichi IKEJIMA, Kunio ESUMI, Kenjiro MEGURO, Hidemasa HONDA, Yasuhiro YAMADA. "Liquefaction of Mixture of Different Coals by Using 1, 2, 3, 4-Tetrahydroquinoline." Journal of the Fuel Society of Japan 62.5 (1983) 365-368