Dyes and pigments, 1997, vol. 34, no 2, pp. 101-107
LYCKA A.; MUSTROPH H.
1H, 13C and 15N NMR spectra of the reaction product of benzenediazonium fluoroborates with 1-phenyl-3-methyl-4-(α-acet-ethylidene)-pyrazol-5-one
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http://dx.doi.org/10.1016/S0143-7208(96)00069-1