Weakly irreducible subgroups of $\mbox {Sp}(1,n+1)$
Archivum mathematicum, Tome 44 (2008) no. 5, pp. 341-352.

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Connected weakly irreducible not irreducible subgroups of $\mbox {Sp}(1,n+1)\subset \mbox {SO}(4,4n+4)$ that satisfy a certain additional condition are classified. This will be used to classify connected holonomy groups of pseudo-hyper-Kählerian manifolds of index 4.
Classification : 53C29, 53C50
Keywords: pseudo-hyper-Kählerian manifold of index 4; weakly irreducible holonomy group
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     title = {Weakly irreducible subgroups of $\mbox {Sp}(1,n+1)$},
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Bezvitnaya, Natalia I. Weakly irreducible subgroups of $\mbox {Sp}(1,n+1)$. Archivum mathematicum, Tome 44 (2008) no. 5, pp. 341-352. http://geodesic.mathdoc.fr/item/ARM_2008__44_5_a1/