1) Eugene Lieber, G. B. L. Smith
Reduction of Nitroguanidine. X. The Hydrolysis of Aminoguanidine in Acid and Basic Media1,2
J. Am. Chem. Soc., 1937, 59 (11), pp 2283–2287
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http://dx.doi.org/10.1021/ja01290a054
A New and Facile Synthesis of Chroman-3-ols, 3,4-Dihydro-2H-[1]-Benzopyran-3-ols
Synthetic Communications, Volume 21, Issue 14 July 1991 , pages 1455 - 1464
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http://dx.doi.org/10.1080/00397919108016418