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Ananthakrishnan Gunasekaran, Joseph H. Boyer. "Dense energetic compounds of C, H, N, and O atoms. III. 5-[4-nitro-(1,2,5)oxadiazolyl]-5H-[1,2,3]triazolo[4,5-c][1,2,5]oxadiazole." Heteroatom Chemistry (1993) 521-524