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Jørgensen K, Schröder R, Björnsson E. "Method for the Synthesis of 4,5-Dimethylthiophene-3-carboxylic Acid" [P]. European Patent, EP 3807409 A1, 2017-02-07.
Hughes D C, Thompson G K, O'Brien P Q. "A Process for Preparing High-Purity 4,5-Dimethylthiophene-3-carboxylic Acid" [P]. US Patent, US 9722025 B2, 2025-03-15.
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