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diff --git a/cuda/3d/par3d_bp.h b/cuda/3d/par3d_bp.h
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+/*
+-----------------------------------------------------------------------
+Copyright 2012 iMinds-Vision Lab, University of Antwerp
+
+Contact: astra@ua.ac.be
+Website: http://astra.ua.ac.be
+
+
+This file is part of the
+All Scale Tomographic Reconstruction Antwerp Toolbox ("ASTRA Toolbox").
+
+The ASTRA Toolbox is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+The ASTRA Toolbox is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
+
+-----------------------------------------------------------------------
+$Id$
+*/
+
+#ifndef _CUDA_PAR3D_BP_H
+#define _CUDA_PAR3D_BP_H
+
+namespace astraCUDA3d {
+
+_AstraExport bool Par3DBP_Array(cudaPitchedPtr D_volumeData,
+                   cudaArray *D_projArray,
+                   const SDimensions3D& dims, const SPar3DProjection* angles);
+
+_AstraExport bool Par3DBP(cudaPitchedPtr D_volumeData,
+             cudaPitchedPtr D_projData,
+             const SDimensions3D& dims, const SPar3DProjection* angles);
+         
+
+}
+
+#endif