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Annals of Global Analysis and Geometry > 2013 > 43 > 4 > 299-329
Journal of Geometry and Physics > 2007 > 57 > 8 > 1601-1630
Letters in Mathematical Physics > 1997 > 39 > 1 > 21-32
Annals of Global Analysis and Geometry > 2013 > 43 > 4 > 299-329
Journal of Geometry and Physics > 2007 > 57 > 8 > 1601-1630
Letters in Mathematical Physics > 1997 > 39 > 1 > 21-32