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Page: https://www.postgresql.org/docs/12/biblio.html
Description:
Ullmann's classic should be
[ull88]
Principles of Database and Knowledge-Base Systems.
Jeffrey D. Ullman. Volume 1. Computer Science Press. 1988.
not
[ull88]
Principles of Database and Knowledge.
Base Systems. Jeffrey D. Ullman. Volume 1. Computer Science Press. 1988.
as Base Systems is not a subtitle