Jan Eric Lenssen Christian Osendorfer Jonathan Masci Deep Iterative Surface Normal Estimation. 11244-11253 2020 CVPR https://openaccess.thecvf.com/content_CVPR_2020/html/Lenssen_Deep_Iterative_Surface_Normal_Estimation_CVPR_2020_paper.html https://doi.org/10.1109/CVPR42600.2020.01126 conf/cvpr/2020 db/conf/cvpr/cvpr2020.html#LenssenOM20