Blasi, A., Fox, S., Everdell, N., Volein, A., Tucker, L., Csibra, G., Gibson, A.P., Hebden, J.C., Johnson, M.H., Elwell, C.E. (2007). Investigation of depth dependent changes in cerebral haemodynamics during face perception in infants. Phys Med Biol., 52(23): 6849-64, doi:10.1088/0031-9155/52/23/005.