C. D. West (1934). "The Crystal Structures of Some Alkali Hydrosulfides and Monosulfides". Zeitschrift für Kristallographie - Crystalline Materials. 88 (1–6): 97–115. doi:10.1524/zkri.1934.88.1.97. S2CID100849097.
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C. D. West (1934). "The Crystal Structures of Some Alkali Hydrosulfides and Monosulfides". Zeitschrift für Kristallographie - Crystalline Materials. 88 (1–6): 97–115. doi:10.1524/zkri.1934.88.1.97. S2CID100849097.