AIM 2019 Challenge on Image Extreme Super-Resolution: Methods and Results. - Shuhang Gu; Hanwen Liu; Dan Zhu; Tangxin Xie; Xin Yang 009; Chen Zhu; Jia Yu 018; Wenyu Sun; Xin Tao 001; Zijun Deng; Liying Lu; Martin Danelljan; et al. (ICCV Workshops, 2019)