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Referencias:

• Kuchacheck r, K.V., (1992) Proceedings of the 4th Canadian Conference on General Relativity and Relativistic Astrophysics, Winnipeg, Manitoba, 1991, , edited by, G. Kunstatter, D. Vincent, J. Williams, World Scientific, Singapore
• Kuchacheck r, K.V., (1991) Conceptual Problems of Quantum Gravity, , edited by, A. Ashtekar, J. Stachel, Birkhäuser, Boston
• Hennaux, M., Teitelboim, C., (1989) Phys. Lett. B, 222, p. 195
• Unruh, W., Wald, R., (1989) Phys. Rev. D, 40, p. 2598
• Kuchar✓, K.V., (1991) Phys. Rev. D, 43, p. 3332
• Lanczos, C., (1986) The Variational Principle of Mechanics, , Dover, New York
• Brown, J.D., York, J.W., (1989) Phys. Rev. D, 40, p. 3312
• The point at Jacobi's variational principle is the building of an action where the information about the time interval tf-ti is replaced by the knowledge of the energy, which enters Jacobi's action as a property of the system; Henneaux, M., Teitelboim, C., (1992) Quantization of Gauge Systems, , Princeton University Press, Princeton, NJ
• Hájícek, P., Origin of nonunitarity in quantum gravity (1986) Physical Review D, 34, p. 1040
• Hájícek, P., Schön, M., (1990) Class. Quantum Grav., 7, p. 861
• Hájícek, P., Dirac quantisation of systems with quadratic constraints (1990) Classical and Quantum Gravity, 7, p. 871
• Hájícek, P., Topology of parametrized systems (1989) Journal of Mathematical Physics, 30, p. 2488
• Kuchacheck r, K.V., (1981) Quantum Gravity 2: A Second Oxford Symposium, , edited by, C. J. Isham, R. Penrose, D. W. Sciama, Clarendon, Oxford
• York, J.W., (1972) Phys. Rev. Lett., 28, p. 1082
• Q should be always intended to be unbounded from above, since this requirement warrants that t=-P reaches infinity on the classical trajectory P2=Q, but there is no obstacle to regarding Q as belonging to an interval (A,∞ ), rather than (-∞ ,∞ ). In such a case one should select the wave function fulfilling varphi (A)=0, in order that hat P=-i partial / partial Q be Hermitian; Ferraro, R., Sforza, D., ; In the case m neq 0, one can still prove that y never reaches 1 if Λ m2-112

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