Schutz, Bernard F. Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society; External Organizations;
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Schutz, B. F. (1970). Perfect Fluids in General Relativity: Velocity Potentials and a Variational Principle. Physical Review D, 2(12), 2762-2773. doi:10.1103/PhysRevD.2.2762.