@article{article18060690,
title   = {The influence of positive or negative charges in the passive and iontophoretic skin penetration of porphyrins used in photodynamic therapy},
author = {Gelfuso, Guilherme Martins and Gratieri, Tais and Souza, Joel Gonçalves de and Thomazine, José A. and Lopez, Renata Fonseca Vianna},
year = {2011},
doi = {10.1016/j.ejpb.2010.11.018},
journal   = {European Journal of Pharmaceutics and Biopharmaceutics}
}