JOURNAL- SICHUAN UNIVERSITY NATURAL SCIENCE EDITION Volume 55 Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 54 Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 53 Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 52 Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 51 Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 50 Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 49 Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 48 Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 47 Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 46 Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 36 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 35 Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 34 Issue spi Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 33 Issue spi Issue sp Issue i Issue 6 Issue 5 Issue 4 Issue 3 Issue 2 Issue 1 Volume 32 Issue 6 Issue 5