Mueller T, Stevens L M, Roberts E F. "一种的合成方法" [P]. US Patent, US 9050835 B2, 2021-11-18.
发明人张德明,罗永刚,钱学锋. "Method for the Synthesis of 4,6-Dihydrothieno[3,4-b]thiophene-2-carboxylic acid" [P]. 中国发明专利, 专利号 CN 109609429 A, 授权公告日 2019-05-21.
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