Zhu Yan-Qing, Liang Jing-Qiu, Liang Zhong-Zhu, Huang Xin-Hua, Le Zi-Chun, Yi Fu-Ting, Hou Feng-Jie, Huang Wan-Xia, Dong Wen, Wang Wei-Biao, Wang Zhi-Li, Cui Nai-Di. Hourglass-shaped X-ray compound refractive lens made by back-mask exposure technologyJ. Acta Physica Sinica, 2009, 58(3): 1526-1530. DOI: 10.7498/aps.58.1526