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By Stephen Hawking and Don N. Page. Communications in Mathematical Physics 87, 577–588. Section 2 gives the Schwarzschild–anti-de Sitter geometry and its Euclidean temperature; section 3 treats the canonical ensemble and the distinction between local and global thermodynamic stability. The original printed paper is dated 1983, despite some repository records giving 1982.

Original paper: www.fis.uc.cl/~mbanados/Cursos/TopicosRelatividadAvanzada/HawkingPage.pdf