Partial Eruption of Solar Filaments. I. Configuration and Formation of Double-decker Filaments oleh Yijun Hou, Chuan Li, Ting Li, Jiangtao Su, Ye Qiu, Shuhong Yang, Liheng Yang, Leping Li, Yilin Guo, Zhengyong Hou, Qiao Song, Xianyong Bai, Guiping Zhou, Mingde Ding, Weiqun Gan, Yuanyong Deng