Geodesic
Overgroups of the diagonal group in the hyperbolic unitary group over a~simple Artin ring.~II
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 17, Tome 356 (2008), pp. 85-117

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We continue our previous paper, where we have described the lattice of overgroups of the diagonal subgroup in the hyperbolic unitary group for a infinite or enough large simple Artin ring. Here we consider the same problem for the hyperbolic unitary group of the second degree over a finite simple Artin ring with a small center. We state the conditions, under which the above lattice admits the standard description. Bibl. – 11 titles. 
@article{ZNSL_2008_356_a2,
     author = {E. V. Dybkova},
     title = {Overgroups of the diagonal group in the hyperbolic unitary group over a~simple {Artin} {ring.~II}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {85--117},
     publisher = {mathdoc},
     volume = {356},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2008_356_a2/}
}
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E. V. Dybkova. Overgroups of the diagonal group in the hyperbolic unitary group over a~simple Artin ring.~II. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 17, Tome 356 (2008), pp. 85-117. http://geodesic.mathdoc.fr/item/ZNSL_2008_356_a2/