Smyth, I.; Du, X.; Taylor, M. S.; Justice, M. J.; Beutler, B.; Jackson, I. J. (2004). „The extracellular matrix gene Frem1 is essential for the normal adhesion of the embryonic epidermis“. Proceedings of the National Academy of Sciences 101 (37): 13560 – 13565. doi:10.1073/pnas.0402760101. PMC 518794. PMID 15345741.
Smyth, I.; Du, X.; Taylor, M. S.; Justice, M. J.; Beutler, B.; Jackson, I. J. (2004). „The extracellular matrix gene Frem1 is essential for the normal adhesion of the embryonic epidermis“. Proceedings of the National Academy of Sciences 101 (37): 13560 – 13565. doi:10.1073/pnas.0402760101. PMC 518794. PMID 15345741.