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> Here's the paper discussing the implementation of Lua 5.0
> 
> See the closure section for the upvalue explanation.
> 
> The Implementation of Lua 5.0 - Roberto Ierusalimschy, Luiz Henrique
> de Figueiredo, Waldemar Celes -
> http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.112.5702&rep=rep1&type=pdf

Also at lua.org:
	http://www.lua.org/docs.html#papers
	http://www.lua.org/doc/jucs05.pdf
	http://www.inf.puc-rio.br/~roberto/talks/lua5-imp.pdf