The 4th draft (updated twice Jul 2009 by ThomasLauer) corrects a few minor errors.
The 3rd draft (updated Feb 2008 by ThomasLauer) corrects a couple very minor glitches and makes clear that the short reference can be used and distributed according to the same terms as Lua 5.1.
There are two PDF files. [luarefv51.pdf] has TWO logical pages per physical page and prints on a total of four pages. The second version has the same textual content but a different layout with ONE logical page per physical page (total of six print pages): [luarefv51single.pdf]
I have also put the MS Word DOC files (Word 2002, v10.4219) used to produce the PDFs into a ZIP: [download]
Corrections and comments please to the lua-l mailing list or to email@example.com.
(Enrico's original 5.0 version is still available: [download])