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Tricky because you can compensate antenna quality with software. So the equations must capture this trade off.  \section{References}  \begin{itemize}  \itemCost Equation for a Millimetre Wave Array  \item http://library.nrao.edu/public/memos/alma/memo006.pdf  \item  Towards cost equation for a multi-element array \item -  http://www.aoc.nrao.edu/evla/geninfo/memoseries/evlamemo29.ps.gz \item Cost Equation for a Millimetre Wave Array - http://library.nrao.edu/public/memos/alma/memo006.pdf  \item Cost  diameter curves \item -  http://library.nrao.edu/public/memos/alma/memo022.pdf \item Millimeter Array Cost Equation Correction \item -  http://library.nrao.edu/public/memos/alma/memo055.pdf \item Cost Benefit analysis for a number of MMA configurations for 30 10m antennas.  \item antennas -  http://library.nrao.edu/public/memos/alma/memo199.pdf \item Same as above, for 64 12m antennas \item -  http://library.nrao.edu/public/memos/alma/memo265.pdf \end{itemize}