K. Baur, Richardson elements for classical Lie algebras, Journal of Algebra, vol.297, issue.1, pp.168-185, 2006.
DOI : 10.1016/j.jalgebra.2005.03.033

URL : https://doi.org/10.1016/j.jalgebra.2005.03.033

M. Brion, Quelques proprietes des espaces homogenes spheriques, Manuscripta Mathematica, vol.12, issue.2, pp.191-198, 1986.
DOI : 10.1007/BF01168684

M. Bender and N. Perrin, Singularities of closures of spherical B-conjugacy classes of nilpotent orbits, preprint 2014, pp.1412-5654

A. Braverman and A. Joseph, The Minimal Realization from Deformation Theory, Journal of Algebra, vol.205, issue.1, pp.13-36, 1998.
DOI : 10.1006/jabr.1997.7349

URL : https://doi.org/10.1006/jabr.1997.7349

D. H. Collingwood and W. M. Mcgovern, Nilpotent orbits in semisimple Lie algebras, 1993.

L. Fresse, Upper triangular parts of conjugacy classes of nilpotent matrices with finite number of $B$-orbits, Journal of the Mathematical Society of Japan, vol.65, issue.3, pp.967-992, 2013.
DOI : 10.2969/jmsj/06530967

URL : https://hal.archives-ouvertes.fr/hal-01281865

L. Fresse and A. Melnikov, Smooth Orbital Varieties and Orbital Varieties with a Dense B-Orbit, International Mathematics Research Notices, vol.91, pp.2013-1122, 2013.
DOI : 10.1007/BF01420525

URL : https://hal.archives-ouvertes.fr/hal-01282642

A. Joseph, On the variety of a highest weight module, Journal of Algebra, vol.88, issue.1, pp.238-278, 1984.
DOI : 10.1016/0021-8693(84)90100-5

A. Joseph, Orbital varietes of the minimal orbit, Ann. Sci. ´ Ecole Norm. Sup, vol.4, pp.31-48, 1998.

N. Spaltenstein, On the fixed point set of a unipotent element on the variety of borel subgroups, Topology, vol.16, issue.2, pp.203-204, 1977.
DOI : 10.1016/0040-9383(77)90022-2

T. Springer, Linear algebraic groups, Progress in Mathematics, vol.9, 1998.

R. Steinberg, On the desingularization of the unipotent variety [13] ` E. B. Vinberg, Complexity of actions of reductive groups, Funktsional. Anal, i Prilozhen, Invent. Math. In Russian; English translation in Funct. Anal. Appl, vol.36, issue.20, pp.209-224, 1976.