10.1364/OE.20.001714.m001 Jeffrey Koskulics Jeffrey Koskulics Steven Englehardt Steven Englehardt Steven Long Steven Long Yongxiang Hu Yongxiang Hu Knut Stamnes Knut Stamnes Media 1: Method of surface topography retrieval by direct solution of sparse weighted seminormal equations Optica Publishing Group 2012 oe 16 January 2012 surface topography retrieval media seminormal equations solution Optics Express Method 2012-01-16 00:00:00 Media https://opticapublishing.figshare.com/articles/media/Media_1_Method_of_surface_topography_retrieval_by_direct_solution_of_sparse_weighted_seminormal_equations/4944539 Originally published in Optics Express on 16 January 2012 (oe-20-2-1714)