Photoacoustic study of the photostability of sunscreens V. M.F.R. da Cruz, D. Acosta-Avalos and P. R. Barja Eur. Phys. J. Special Topics, 153 (2008) 483-486 Published online: 12 March 2008 DOI: 10.1140/epjst/e2008-00490-8