What other formalisms exist to solve the general relativity equations and their observables (such as energy, momentum and angular momentum of gravitational waves), in addition to the Cartan structure equations formalism, Killing equations, Lie algebras, Newman-Penrose formalism, and spinorial formalism, and what are their characteristics, advantages and disadvantages, including the advantages and disadvantages of these five formalisms mentioned (since I know their characteristics more or less)? And where can I consult them?

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