@article{Purdon_2004 author = {Carryn H. Purdon and Chad G. Azzi and Jin Zhang and Eric W. Smith and Howard I. Maibach}, title = {Penetration Enhancement of Transdermal Delivery—Current Permutations and Limitations}, journal = {Critical Reviews™ in Therapeutic Drug Carrier Systems}, issn = {0743-4863}, year = {2004}, volume = {21}, number = {2}, }