In the January 10 Chronicle of Higher Education

Elsevier Science is deleting scientific articles from its online databases. The the Chronicle of Higher Education quotes Elsevier:

Only under extraordinary circumstances can an article be removed (e.g., plagiarism, scientific misconduct, gross error such that human safety is at risk) and then a statement is inserted to indicate the removal.

This highlights one of the unique difficulties true archives face in keeping their promise of perpetually preserving a work. [via FOS Blog].