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Mineely, P. J., & Tariq, S. A. (1987). Molten potassium pyrosulfate: The reactions of seven metal oxalates. Thermochimica Acta, 114(2), 281–286. doi:10.1016/0040-6031(87)80049-7 
10.1016/0040-6031(87)80049-7