@article {hossain10, title = {Toward High Quality Gradient Estimation on Regular Lattices}, journal = {IEEE Transactions on Visualization and Computer Graphics}, volume = {17}, number = {4}, year = {2011}, month = {04/2011}, pages = {426-439}, publisher = {IEEE Computer Society}, address = {Los Alamitos, CA, USA}, keywords = {Approximation theory, body-centered cubic lattice, box splines, normal reconstruction, orthogonal projection, Taylor series expansion}, doi = {10.1109/TVCG.2010.37}, url = {http://doi.ieeecomputersociety.org/10.1109/TVCG.2010.37}, author = {Zahid Hossain and Usman R. Alim and Torsten M{\"o}ller} }