Will appreciate your assistance with this paper:
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Authors: M. Rahman; K. Khan; Z. Siddiqi; A. Zaman
Journal: Indian Journal of Chemistry B 1990, vol. 29B, # 10 p. 941 - 943
Title: A convenient route for 3-formyl-4-hydroxycoumarin and reactions of 3-bromo-4-hydroxycoumarin
Thanks in first place. Will also check reference