J. Anselmann, H. S. Nanoparticle-res, F. Schaefer, J. Watts, B. Brod et al., 3, 329. 2 Synthetic amorphous silica Follicular penetration, in Prediction of percutaneous penetration. Methods, measurements, ECETOC JACC report n°51 IBC Technical Sevices, pp.163-173, 1990.

O. Lieleg and K. Ribbeck, Biological hydrogels as selective diffusion barriers, Trends in Cell Biology, vol.21, issue.9, p.543, 2011.
DOI : 10.1016/j.tcb.2011.06.002

URL : http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3164742