JOURNAL OF MATHEMATICAL RESEARCH AND EXPOSITION -CHINESE EDITION- Volume 19 Issue supp Issue 4 Issue 3 Issue 2 Issue 1 Volume 18 Issue 4 Issue 3 Issue 2 Issue 1 Volume 17 Issue 4 Issue 3 Issue 2 Issue 1 Volume 16 Issue 4 Issue 3 Issue 2 Volume 15 Issue sup Issue 4