%0 Journal Article %T Absolute flatness measurements by Fizeau interferometer and 3D scanning deflectometric profiler %A Kondo, Yohan %A Bitou, Youichi %J Proceedings of SPIE %V 11492 %P 1149203-1149203-9 %@ 0277-786X %D 2020-08-21 %I SPIE %~ DeepDyve