This is a simple bibliographic request that I have been unable to pin down. Max Dehn's solution to Hilbert's 3rd problem is:

Max Dehn, "Über den Rauminhalt."

Mathematische Annalen55(190x), no. 3, pages 465–478.

It is variously cited as either 1901 or 1902 (but always volume 55; Hilbert's own footnote cites volume 55 "soon to appear"). E.g.,

- Mathworld cites it as 1902.
- The Encyclopedic Dictionary of Mathematics cites it as 1902.
- Wikipedia says 1901.
- Various papers, e.g., this one, and Tao's book, cite it as 1901.

I have been unsuccessful in finding the definitive year via the web, because of all
the conflicting citations. The next step is to retrieve
*Mathematische Annalen* volume 55, but perhaps someone can spare me that trouble...?
Thanks!