Funkquist E.-L., Tuvemo T., Jonsson B., Serenius F. and Hedberg-Nyqvist K. (2009) “Growth and Breastfeeding among Low Birth Weight Infants Fed with or without Protein Enrichment of Human Milk”, Upsala Journal of Medical Sciences, 111(1), pp. 97–108. doi: 10.3109/2000-1967-021.