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    Vladimir A. Ogurtsov et al.. “[1, 2, 5]Oxadiazolo[3, 4-d]pyridazine 1, 5, 6-trioxides: efficient synthesis via the reaction of 3, 4-bis(hydroxyimino)methyl)-1, 2, 5-oxadiazole 2-oxides with a mixture of concentrated nitric and trifluoroacetic acids and structural characterization.” Tetrahedron letters, vol. 59, no. 32, 2018, pp. 3143–3146. http://access.bl.uk/ark:/81055/vdc_100066511007.0x000057