Leibniz integration rule reference I'm looking for a nice reference for the "Leibniz integral rule".
Do you know one?

Thank you
Might be a bit late, but one reference that looks nice is 

Differentiation Under the Integral Sign

Harley Flanders

The American Mathematical Monthly , Vol. 80, No. 6 (Jun. - Jul., 1973) , pp. 615-627

Published by: Mathematical Association of America

Article DOI: 10.2307/2319163

Article Stable URL: http://www.jstor.org/stable/2319163

Avaiable at jstor
I think this is what your'e looking for