id: 50263974 dt: j an: 50263974 au: Peng, Yao; Zhang, Jinyu; Wang, Yan; Yu, Zhiping ti: Gradient-based source and mask optimization in optical lithography so: IEEE Transactions on Image Processing 20, No. 10, 2856-2864 (2011). py: 2011 pu: la: EN cc: ut: ci: li: doi:10.1109/TIP.2011.2131668