N. A. Gavrilova, E. S. Semichenko, O. S. Korotchenko and G. A. Suboch. Cyclocondensation of ethyl nitroacetate with 2-hydroxybenzaldehydes // Russian Journal of Organic Chemistry. 2008. Vol. 44(4), pp 624-625.
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http://dx.doi.org/10.1134/S1070428008040283
