1. Reichenbach, H., The philosophy of space and time. First published in German under the title Philosophie der Raum-Zeit-Lehre in Berlin, 1927. Reprinted by Dover, New York, 1958.
2. Duff, M. J., Supermembranes: An Introduction. In Gauge Theories applied supersymmetry and quantum gravity II, ed. Servin et al., Imperial College Press, London, 1977, pp. 23–55.
3. Wheeler, J. A., Geometrodynamics and the issue of the final state. In Relativity, Groups and Topology, ed. DeWitt and DeWitt, Gordon and Breach, New York, 1964.
4. Ord, G. N., Conrad, M., Rössler, O., El Naschie, M. S., Nonlinear Dynamics, General Relativity and the Quantum. Chaos, Solitons and Fractals, 1997, 8 (5) .