Try the article:

"Breastfeeding and the Working Mother: Effect of
Time and Temperature of Short-term Storage on
Proteolysis, Lipolysis, and Bacterial Growth in
Milk" by Margit Hamosh. Pediatrics, Vol. 97 No. 4
April 1996.

Also try searching medline for articles by the
same author, because I have read many articles
written by her regarding this topic.

Rachel Brusseau