1. Crandall, B. C. & Lewis, J. (eds) Nanotechnology (MIT Press, Cambridge, 1992).
2. Hameroff, S. R. Ultimate Computing: Biomolecular Consciousness and Nanotechnology (Elsevier, Amsterdam, 1987).
3. Drexler, E. Nanosystems: Molecular Machinery, Manufacturing and Computation (Wiley, New York, 1992).
4. Ball, P. Nature 362, 123 (1993).
5. Radelaar, S. in Physics and Technology of Semiconductor Quantum Devices (eds Ploog, K. H. & Tapfer, L.) 27–51 (Springer, Berlin, 1993).