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URL : http://arxiv.org/abs/math/9908012

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S. [. Guillemin and . Sternberg, Convexity properties of the moment mapping. II, Inventiones Mathematicae, vol.249, issue.3, pp.533-546, 1984.
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]. A. Kl1 and . Klyachko, Stable bundles, representation theory and Hermitian operators, Selecta Math. (NS), vol.4, issue.3, pp.419-445, 1998.

]. A. Kl2 and . Klyachko, Vector bundles, linear representations, and spectral problems, Proceedings of the International Congress of Mathematicians, pp.599-613, 2002.

]. V. Ko and . Kostov, The Deligne-Simpson problem?a survey, J. Algebra, vol.281, pp.83-108, 2004.

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. [. Nicas, Classifying pairs of lagrangians in a hermitian vector space, Topology and its Applications, vol.42, issue.1, pp.71-81, 1991.
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]. J. Sa and . Sauter, Isomorphisms among monodromy groups and applications to lattices in P U (1, 2), Pacific J. Math, vol.146, issue.2, pp.331-384, 1990.

]. F. Sf and . Schaffhauser, Decomposable representations and Lagrangian submanifolds of moduli spaces associated to surface groups. Thesis, 2005.

]. R. Sz1 and . Schwartz, Complex hyperbolic triangle groups, Proceedings of the International Congress of Mathematicians, pp.339-349, 2002.

R. E. Schwartz, Spherical CR geometry and Dehn surgery, 2004.

. [. Weinstein, Poisson geometry of discrete series orbits, and momentum convexity for noncompact group actions, Letters in Mathematical Physics, vol.56, issue.1, pp.17-30, 2001.
DOI : 10.1023/A:1010913023218

. [. Weinstein, The geometry of momentum. Preprint, arXiv:math, SG, p.208108, 2002.