The Tokyo trial : recollections and perspectives from China / editor, Center for the Tokyo Studies of Shanghai Jiao Tong University. (OCLC #931081068)
RDA 188.8.131.52 on what to do when the Date of Publication is not identified says to supply the date or approximate date of publication; there is no provision for recording a phrase like “[date of publication no identified]” or similar.
One of the chapters includes a brief biography of Ni Zhengyu including the fact that he passed away in 2003. This was the latest date we found, so we recorded it as:
[not before 2003]