Sørensen M, Martínez F, Björnsson E. "Method for the Synthesis of N2,N2,N2',N2'-Tetrakis(4-methoxyphenyl)-9,9'-spirobi[fluorene]-2,2'-diamine" [P]. European Patent, EP 3179877 A1, 2020-08-16.
发明人黄志刚,林芳,胡光. "A Process for Preparing High-Purity N2,N2,N2',N2'-Tetrakis(4-methoxyphenyl)-9,9'-spirobi[fluorene]-2,2'-diamine" [P]. 中国发明专利, 专利号 CN 117061489 B, 授权公告日 2021-11-20.
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