The following code generates an error about "! LuaTeX error ...onTeXt/tex/texmf-local/tex/context/base/bibl-tra.lua:192: attempt to compare number with string"
\startpublication[k=1,t=article,a={{Test},{}},y=2012]
\artauthor[]{Test}[T.]{}{Test}
\pubyear{2012}
\arttitle{Test}
\journal{Test}
\pages{1}
\stoppublication
\starttext
abc\cite[1]
\placepublications[criterium=text]
\stoptext
I also tried the bibtex alternative, and it got the same error as well.
$ context --version
mtx-context | main context file: d:/ConTeXt/tex/texmf-local/tex/context/base/context.mkiv
mtx-context | current version: 2011.04.11 18:55
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Best Regards
Chen