Jennifer,
I would suggest you contact one or both of the primary pump
companies.  I'm sure they keep on top of whatever research is being
done in this area.  We happen to work with Medela and I know they
have a lot of information.  Of course they have a vested interest in
helping establish workplace pumping stations beyond the benefits to
mom and baby.  However, I would expect that they would have
references to research in addition to that which they have supported
themselves.
You might also contact Rep. Carolyn Maloney's website.  (check the
archives for it)  She has been working on getting government support
in the form of tax credits for companies woh facilitate pumping.

Winnie

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