Spiers, A., Pound, A., & Wardell, B. (2023). Second-order perturbations of the Schwarzschild spacetime: Practical, covariant and gauge-invariant formalisms.
Chicago Style (17th ed.) CitationSpiers, Andrew, Adam Pound, and Barry Wardell. Second-order Perturbations of the Schwarzschild Spacetime: Practical, Covariant and Gauge-invariant Formalisms. 2023.
MLA (9th ed.) CitationSpiers, Andrew, et al. Second-order Perturbations of the Schwarzschild Spacetime: Practical, Covariant and Gauge-invariant Formalisms. 2023.
Warning: These citations may not always be 100% accurate.