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Carlos D. Correa, Robert Hero, KwanLiu Ma, "A Comparison of Gradient Estimation Methods for Volume Rendering on Unstructured Meshes," IEEE Transactions on Visualization and Computer Graphics, vol. 17, no. 3, pp. 305319, March, 2011.  
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@article{ 10.1109/TVCG.2009.105, author = {Carlos D. Correa and Robert Hero and KwanLiu Ma}, title = {A Comparison of Gradient Estimation Methods for Volume Rendering on Unstructured Meshes}, journal ={IEEE Transactions on Visualization and Computer Graphics}, volume = {17}, number = {3}, issn = {10772626}, year = {2011}, pages = {305319}, doi = {http://doi.ieeecomputersociety.org/10.1109/TVCG.2009.105}, publisher = {IEEE Computer Society}, address = {Los Alamitos, CA, USA}, }  
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TY  JOUR JO  IEEE Transactions on Visualization and Computer Graphics TI  A Comparison of Gradient Estimation Methods for Volume Rendering on Unstructured Meshes IS  3 SN  10772626 SP305 EP319 EPD  305319 A1  Carlos D. Correa, A1  Robert Hero, A1  KwanLiu Ma, PY  2011 KW  Volume rendering KW  gradient estimation KW  local illumination KW  unstructured meshes KW  flow visualization. VL  17 JA  IEEE Transactions on Visualization and Computer Graphics ER   
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