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- [34] STUDIES ON VILSMEIER-HAACK REACTION - A VERSATILE NEW SYNTHESIS OF 5-CHLORO-3-METHYLPYRAZOLE-4-CARBOXALDEHYDE, 5-CHLORO-3-METHYL-1-PHENYLPYRAZOLE-4-CARBOXALDEHYDE AND RELATED FUSED HETEROCYCLIC-COMPOUNDS AND HETEROCYCLIC SCHIFFS BASES INDIAN JOURNAL OF CHEMISTRY SECTION B-ORGANIC CHEMISTRY INCLUDING MEDICINAL CHEMISTRY, 1994, 33 (02): : 156 - 158