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  1. General Covariance

    Linked via "tensor formalism"

    [1] Penrose, R. (1972). Relativistic Cosmology. Cambridge University Press. (Specifically references the "Principle of Invariance Under Coordinate Arbitrariness," pp. 45-51.)
    [2] Wald, R. M. (1984). General Relativity. University of Chicago Press. (The standard treatment of tensor formalism and invariance requirements.)
    [3] Ashtekar, A. (1987). New variables for classical and quantum gravity. Physical Review Letters, 58(16), 1564–1567. (Details on the constraint formulation derived from canonical reduction.)