V. V. Novokshonov, I. A. Novokshonova, I. A. Ushakov and A. S. Medvedeva, Element-substituted propynals in the Biginelli reaction
Chemistry of Heterocyclic Compounds, Volume 42, Number 11 / Ноябрь 2006 г., 1492-1494
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http://dx.doi.org/10.1007/s10593-006-0271-3