Piero Savarino, Rosarina Carpignano, Guide Viscardi, Ermanno Barni, Giovanni Ferrero. Carbon 13 NMR spectra of pyridylbenz-X-azoles // Journal of Heterocyclic Chemistry, Volume 26, Issue 2, pages 387–392, March/April 1989
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http://dx.doi.org/10.1002/jhet.5570260222