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\subsection{Engineering cost vs. Calibration cost}  Tricky because you can compensate antenna quality with software. So the equations must capture this trade off.  \section{References}  \begin{itemize}  \item  Cost 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 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  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}