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Ohrbach, K.-H., Matuschek, G., & Kettrup, A. (1987). Simultaneous thermal analysis-mass spectrometric investigations of volatiles released from coal samples. Thermochimica Acta, 121, 87–96. doi:10.1016/0040-6031(87)80163-6 
10.1016/0040-6031(87)80163-6