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A. V. Kalinin, A. J. M. Da Silva, C. C. Lopes, R. S. C. Lopes, V. Snieckus,
"Directed ortho metalation - cross coupling links. Carbamoyl rendition of the baker-venkataraman rearrangement. Regiospecific route to substituted 4-hydroxycoumarins" Tetrahedron. Lett., 1998, 39, 4995-4998.
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http://dx.doi.org/10.1016/S0040-4039(98)00977-0