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Abstract
1.
Introduction
2.
Preliminaries
3. External Field
Approximation: Dirichlet Boundary Conditions
4. External Field
Approximation: General Boundary Conditions
5. Beyond the
External Field Approximation
6. Discussion and
Extensions
Acknowledgments
References
Notes
Reference: J. Ambjørn and S. Wolfram, Annals of Physics 147 (1983) 33-56.
