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Notes on General Relativity
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Quantum Gravity
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Quantum Physics, Relativity, and Complex Spacetime: Towards a New Synthesis
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Quantum Statistical Field Theory in Gravitation and Cosmology
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by Arthur W. Conway, 1915

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Space, Time and Gravitation: An Outline of the General Relativity Theory
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Spacetime Wrinkles
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Spin Foam Models for Quantum Gravity
by Alejandro Perez, 2003, 80 pages, 870KB, PDF

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