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http://spectrabase.com/article/10.1002/(sici)1097-458x(199701)35:1<35::aid-omr25>3.0.co;2-k (accessed Dec 16, 2018).

Spectra for: Substituent effects on the15N NMR Parameters of Azoles
ROSA MARÍA CLARAMUNT, DIONISIA SANZ, CONCEPCIÓN LÓPEZ, JOSÉ ANTONIO JIMÉNEZ, MARÍA LUISA JIMENO*, JOSÉ ELGUERO, ALAIN FRUCHIER