W. Ballmann, 1997, Geom. Funct. Anal., 7, 615, 10.1007/s000390050022
M. R. Bridson, 1999, Metric Spaces of Non-positive Curvature, 10.1007/978-3-662-12494-9
K. S. Brown, 1988, Buildings
K. Corlette, 1988, J. Differential Geom., 28, 361, 10.4310/jdg/1214442469
K. Corlette, 1992, Ann. Math., 135, 165, 10.2307/2946567
S. K. Donaldson, 1987, Proc. London Math. Soc., 55, 127, 10.1112/plms/s3-55.1.127
J. Eells, 1964, Amer. J. Math., 86, 109, 10.2307/2373037
W. Feit, 1964, J. Algebra, 1, 114, 10.1016/0021-8693(64)90028-6
H. Garland, 1973, Ann. Math., 97, 375, 10.2307/1970829
M. Gromov, 1993, Asymptotic invariants of infinite groups, 1
M. Gromov, 2003, Geom. Funct. Anal., 13, 73, 10.1007/s000390300002
M. Gromov, 1992, Publ. Math. IHES, 76, 165, 10.1007/BF02699433
de la Harpe, P. and Valette, A.: La propriété (T) de Kazhdan pour les groupes localement compactes, Astérisque 175 (1989).
Izeki, H. and Nayatani, S.: Combinatorial harmonic maps and superrigidity (Japanese), In: Hyperbolic Spaces and Discrete Groups II (Kyoto, 2001), RIMS Kokyuroku 1270 (2002), 182–194.
H. Izeki, 2003, Perspectives of Hyperbolic Spaces (Kyoto, 2002), RIMS Kokyuroku, 1329, 1
J. Jost, 1997, Calc. Var., 2, 173, 10.1007/BF01191341
J. Jost, 1995, Comment. Math. Helv., 70, 659, 10.1007/BF02566027
J. Jost, 1997, Nonpositive Curvature: Geometric and Analytic Aspects, 10.1007/978-3-0348-8918-6
Jost, J.: Nonlinear Dirichlet forms, In New Directions in Dirichlet Forms, Stud. Adv. Math. Amer. Math. Soc., Providence, 1998, pp. 1–48.
J. Jost, 1991, Differential Geometry and Minimal Submanifolds, 241
J. Jost, 1993, Proc. Sympos. Pure Math., 54-I, 245, 10.1090/pspum/054.1/1216587
M. Korevaar, 1993, Comm. Anal. Geom., 1, 561, 10.4310/CAG.1993.v1.n4.a4
M. Kotani, 2000, Trans. Amer. Math. Soc., 353, 1, 10.1090/S0002-9947-00-02632-5
F. Labourie, 1991, Proc. Amer. Math. Soc., 111, 877
É. Lebeau, 1996, Ann. inst. Fourier, 46, 1183, 10.5802/aif.1545
G. Margulis, 1997, Amer. Math. Soc. Trans., 190, 33
U. F. Mayer, 1998, Comm. Anal. Geom., 6, 199, 10.4310/CAG.1998.v6.n2.a1
N. Mok, 1993, Invent. Math., 113, 57, 10.1007/BF01244302
P. Pansu, 1998, Bull. Soc. Math. France, 126, 107, 10.24033/bsmf.2322
Sarnak, P.: Some Applications of Modular Forms, Cambridge Tracts in Math. 99, Cambridge Univ. Press, 1990.
M.-T. Wang, 1998, J. Differential Geom., 50, 249, 10.4310/jdg/1214461170
M.-T. Wang, 2000, Comm. Anal. Geom., 8, 545, 10.4310/CAG.2000.v8.n3.a5
A. Żuk, 1996, C.R. Acad. Sci. Paris, 323, 453
A. Żuk, 2003, Geom. Funet. Anal., 13, 643, 10.1007/s00039-003-0425-8
