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Almlöf, J.; Lundgren, J. O.; Olovsson, I. (15 May 1971). "Hydrogen bond studies. XLV. The crystal structure of HClO4.2.5H2O". Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry. 27 (5). International Union of Crystallography (IUCr): 898–904. doi:10.1107/s0567740871003236. ISSN0567-7408.