1) Misa V. Jovanovic
Synthesis of the First Monosubstituted 1,2,4-Triazine Di-N-oxide. 13C NMR of 1,2,4-Triazine N-Oxides and Use of Hydrogen/Deuterium Isotope Shifts for the Assignments of Some Dihydro-1,2,4-triazine Tautomers
Hetericycles 1986 Volume 24, Issue 4 Pages 951-966
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http://dx.doi.org/10.3987/R-1986-04-09511,2,4-Triazines. Synthesis of Selected Members of the s-Triazolo [3,4-f][1,2,4]triazine and Tetrazolo[1,5-f][1,2,4]triazine Ring Systems
J Heterocyclic Chemistry 1979, Volume 16, pp. 555-560
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https://www.jhetchem.com/cd2html.php?file=19790555