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5Synthesis of 6- and 8-nitroindolizines, Chemistry of Heterocyclic Compounds Dipole moments and spectroscopic properties of methyl-4-nitropyridine N-oxides, Monatshefte f??r Chemie / Chemical Monthly Electronic spectra and structure of methyl derivatives of 4-nitropyridine N-oxide, Chemistry of Heterocyclic Compounds Absorption spectra of nitro derivatives. 2-alkylamino-4-nitropicolines and their N-oxides, Chemistry of Heterocyclic Compounds The effect of electronic factors on the reactivity of heteroaromatic N-oxides, Chemistry of Heterocyclic Compounds