1. The mechanism of the electrophilic substitution of heteroaromatic compounds. Part VI. The nitration of pyridines in the 3-position as free bases and as conjugate acids C. D. Johnson,A. R. Katritzky,B. J. Ridgewell,M. Viney J. Chem. Soc. B 1967 1204
2. 700. The mechanism of electrophilic substitution of heteroaromatic compounds. Part I. Acid-catalysed hydrogen exchange of lutidine and collidine A. R. Katritzky,B. J. Ridgewell J. Chem. Soc. 1963 3753