Journal of Geometry and Physics
Journal of Geometry and Physics > 2011 > 61 > 8 > 1625-1629
Journal of Geometry and Physics > 2014 > 79 > Complete > 14-28
Journal of Geometry and Physics > 2011 > 61 > 8 > 1625-1629
Journal of Geometry and Physics > 2014 > 79 > Complete > 14-28