1. Monosubstituted guanidines from primary amines and aminoiminomethanesulfonic acid
Keekyung Kim, Yi-Tsong Lin and Harry S. Mosher
Tetrahedron Letters
Volume 29, Issue 26, 1988, Pages 3183-3186
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http://dx.doi.org/10.1016/0040-4039(88)85116-5 Tse-Lok Ho, George A. Olah
J. Org. Chem., 1977, 42 (18), pp 3097–3098
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http://dx.doi.org/10.1021/jo00438a033