Bibliography entry [00Z0]
G. W. Gibbons and S. W. Hawking. Gravitational instantons. Phys. Lett. B, 78:430-432, 1978.
Shared chapter 100: Gravitational instantons
Original bibliography occurrence · Collected references
Distinct from ref-078:Ha despite identical title: authors, journal and year differ.
Exact source provenance retained in the project evidence.