[OS X TeX] Problem with refs to label in algorithmic

Christopher Brewster C.Brewster at dcs.shef.ac.uk
Sun Apr 13 12:08:59 EDT 2008

I am using the 'algorithm' and 'algorithmic' styles to lay out an  
Using \ref{} to a label inside them produces an error:
"Latex Error: ./Chapters/chap10.tex:187 Undefined control sequence."

*However*, the references are correctly typeset.
Any suggestions?


Example usage is this:
	\caption{The Abraxas Algorithm}\label{al:abraxas}
		\Procedure{Abraxas}{$C_i, P_i, T_i$}
		\State Increment iteration index:  $\{C_i, P_i, T_i| i = i + 1\}$

We can describe the procedure presented in Algorithm \ref{al:abraxas}  
as follows: .....

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