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J. Chem. Soc., Trans., 1913, 103, 1378 - 1391
Hans Krall
CL.—Guanidine thiocyanate: its formation from ammonium thiocyanate
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http://dx.doi.org/10.1039/CT9130301378J. Am. Chem. Soc., 1940, 62 (4), pp 842–846
Some Derivatives of Cyameluric Acid and Probable Structures of Melam, Melem and Melon
C. E. Redemann, H. J. Lucas
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http://dx.doi.org/10.1021/ja01861a038