What happens when scholarly research published in journals, books, proceedings or other documents changes? Corrections, updates, errata, and even retractions and withdrawals are sometimes necessary. How can you find out about these changes?
Look for the CrossMark logo appearing in ejournals (online HTML or downloaded PDF).
Just click on the CrossMark logo and a status box will tell you if the document is current or if updates are available.
The CrossMark service comes from CrossRef, the association of scholarly publishers which already asssigns DOI to documents.