A. Peres. On Cauchy's problem in general relativity - II 26 (1). Springer. 1962: 53–62. doi:10.1007/BF02754342.|journal=被忽略 (帮助)
U.H. Gerlach. Derivation of the Ten Einstein Field Equations from the Semiclassical Approximation to Quantum Geometrodynamics. Physical Review. 1968, 177 (5): 1929–1941. Bibcode:1969PhRv..177.1929G. doi:10.1103/PhysRev.177.1929.
harvard.edu
ui.adsabs.harvard.edu
U.H. Gerlach. Derivation of the Ten Einstein Field Equations from the Semiclassical Approximation to Quantum Geometrodynamics. Physical Review. 1968, 177 (5): 1929–1941. Bibcode:1969PhRv..177.1929G. doi:10.1103/PhysRev.177.1929.