Bishop B.C., Marley H., McCullough K.J., Preston P.N. and Wright S. H. B. / Synthesis and reac-tions of [1,2,4]triazolo[4,3-a]pyridinium-3-aminides and [1,2,4]triazolo[4,3-a]pyrimidinium-3-aminides: evaluation of the scope and mechanism of a new type of heterocyclic rearrangement // J. Chem. Soc., Perkin Trans. 1. – 1993. – P. 705-714
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http://pubs.rsc.org/en/Content/ArticleLanding/1993/P1/P19930000705