Why did this journal retract two 1940s papers by Max Planck?

A scientific journal has retracted two papers by Max Planck from the nineteen-forties after discovering the papers had become digitally unavailable — their links now pointing to blank pages and empty PDFs. According to Ars Technica, the discovery has raised concerns about scholarly integrity and the long-term preservation of scientific archives. The retraction highlights the challenges journals face in maintaining reliable records of their own publications, even when authored by some of history's most celebrated physicists.

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