Charge coupled devices (CCD) photometry and long-term optical variability of gamma-ray-loud BL Lacertae object Mkn 421
张雄, 郑永刚, 张皓晶, 胡绍明, 谢照华
Charge coupled devices (CCD) photometry and long-term optical variability of gamma-ray-loud BL Lacertae object Mkn 421
Zhang Xiong(张雄), Zheng Yong-Gang(郑永刚), Zhang Hao-Jing(张皓晶), Hu Shao-Ming(胡绍明), and Xie Zhao-Hua(谢照华)
中国物理B . 2006, (9): 2185 -2192 .  DOI: 10.1088/1009-1963/15/9/047