here is the one I was discussing a few weeks ago about energy expenditure of formula vs. breastmilk..

http://pediatrics.aappublications.org/cgi/reprint/124/6/e1149?maxtoshow=&hits=10&RESULTFORMAT=&fulltext=Energy+Expenditure+for+Breastfeeding+and+Bottle-Feeding+Preterm+Infants.++Pediatrics+2009%3B124%3A31149-e1152&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT

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