1. Levin ED, Decker MW, Butcher LL (eds) (1992) Neurotransmitter interactions and cognitive function. Birkhäuser, Basel
2. Russell RW (1992) Interactions among neurotransmitters: Their importance to the “Integrated Organism”. In: Levin ED, Decker MW, Butcher LL (eds): Neurotransmitter interactions and cognitive function. Birkhäuser, Basel