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European Mathematical Society. pp. 205–216. doi:10.4171/013-1/8. ISBN 978-3-03719-013-5. Matsuda, H. (1984). "A note on an isometric imbedding of upper half-space...

and Their Conformal Boundaries. European Mathematical Society. ISBN 978-3-03719-013-5. Brown, J. David; Henneaux, Marc (1986). "Central charges in the canonical...