1. Sparks, M.; Teal, G. K. Method of Making p-n Junctions in Semiconductor Materials. U.S. Patent US2,631,356, June 15, 1950.
2. Woodyard, J. R. Nonlinear Circuit Device Utilizing Germanium. U.S. Patent US2,530,110, 1950.
3. Chizinsky, G.; Farms, B.; Simon, E. Controlled Doping of Semiconductors. U.S. Patent US3,574,009, 1971.
4. Doping of organic semiconductors
5. Electrical doping: the impact on interfaces of -conjugated molecular films