Ming Liu Yinfeng Xu Chengbin Chu Feifeng Zheng Online scheduling on two uniform machines to minimize the makespan. 2099-2109 2009 410 Theor. Comput. Sci. 21-23 http://dx.doi.org/10.1016/j.tcs.2009.01.007 db/journals/tcs/tcs410.html#LiuXCZ09