1.Chapman,D.D. et al.;
Method for annelation of pyridinium rings on to nitrogen heterocycles
Journal of the Chemical Society, Chemical Communications;
1974; 647 - 648;
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http://dx.doi.org/10.1039/c39740000647Reaction of 1,2,4-triazolo [4,3-a] pyridine with dimethyl acetylenedicarboxylate: new structures and mechanisms
Journal of the Chemical Society, Chemical Communications;
21; 1982; 1280 - 1282
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http://dx.doi.org/10.1039/c39820001280Synthesis and dimerisation of [1,2,4]triazolo[4,3-a]pyrimidinium-3-aminides
Journal of the Chemical Society, Chemical Communications;
7; 1988; 506 - 507;
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http://dx.doi.org/10.1039/c39880000506