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Alan J. Morris, Colin H. L. Kennard, John R. Hall, Graham Smith
Crystal structures of dipotassium N-methylnitrogenbis(trioxosulphate), K2[CH3N(SO3)2], potassium N-methylimido(trixosulphate) K[CH3NH(SO3) and N,N-dimethylsulphamic acid, [H(CH3)2N+(SO−3]
Inorganica Chimica Acta - 1982. – Vol. 62. – P. 247-252
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http://dx.doi.org/10.1016/S0020-1693(00)88509-6