Xiang-En Chen, Wenyu He, Zepeng Li & Bing Yao
10.13447/j.1674-5647.2014.03.04Commun. Math. Res., 30 (2014), pp. 222-236.
Lei Zhang, Qingyu Zheng & Shaoguang Shi
10.13447/j.1674-5647.2014.03.07Commun. Math. Res., 30 (2014), pp. 257-264.
Xiang-En Chen, Wenyu He, Zepeng Li & Bing Yao
10.13447/j.1674-5647.2014.03.04Commun. Math. Res., 30 (2014), pp. 222-236.
Lei Zhang, Qingyu Zheng & Shaoguang Shi
10.13447/j.1674-5647.2014.03.07Commun. Math. Res., 30 (2014), pp. 257-264.