Levine SP, Huggins JE, BeMent SL, Kushwaha RK, Schuh LA, Rohde MM, et al. (June 2000). "A direct brain interface based on event-related potentials". IEEE Transactions on Rehabilitation Engineering. 8 (2): 180–185. doi:10.1109/86.847809. PMID10896180.
Levine SP, Huggins JE, BeMent SL, Kushwaha RK, Schuh LA, Rohde MM, et al. (June 2000). "A direct brain interface based on event-related potentials". IEEE Transactions on Rehabilitation Engineering. 8 (2): 180–185. doi:10.1109/86.847809. PMID10896180.