. 2015 Nov 10;2015:418106. doi: 10.1155/2015/418106
Copyright © 2015 W. Gao and W. Wang.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 8.
The molecular graphs G i (i = 1,2, 3,4).