Leistner, Thomas: Lorentzian manifolds with special holonomy and parallel spinors.
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Slovák, Jan
and Čadek, Martin (eds.): Proceedings of the 21st Winter School "Geometry and Physics".
Circolo Matematico di Palermo, Palermo, 2002.
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Schwachhöfer, Lorenz J.: Irreducible holonomy representations.
(English).
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Slovák, Jan
and Čadek, Martin (eds.): Proceedings of the 20th Winter School "Geometry and Physics".
Circolo Matematico di Palermo, Palermo, 2001.
pp. 59-81