Farid Karimipour Mahmoud Reza Delavar Andrew U. Frank A Mathematical Tool to Extend 2D Spatial Operations to Higher Dimensions. 153-164 2008 ICCSA (1) http://dx.doi.org/10.1007/978-3-540-69839-5_12 conf/iccsa/2008-1 db/conf/iccsa/iccsa2008-1.html#KarimipourDF08