1. A Manual of Electrotherapy;Watkins,1968
2. Therapeutic action of constant current;Turnell,1921
3. Introduction of medicinal substances into the depth of tissues by electric current;Leduc;Ann. d'Electrobiol.,1900
4. Electric Ions and their Uses in Medicine;Leduc,1908
5. Skin Permeability;Schaefer,1982