2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/198251We consider the duality of the quasilocal black hole thermodynamics, explicitly the quasilocal black hole thermodynamic first law, in BTZ black hole solution as a special one of the three-dimensional low energy effective string theory.9 pages, no figures, 1 reference added, talk given at 5th Italian-Korean Symposium on Relativistic Astrophysics, Seoul and Suanbo, Korea, 1-7 Sept. 1997General Relativity and Quantum CosmologyHigh Energy Physics - Theorytext