%0 Journal Article %T Theoretical Study of Effect of the Number of N,N-dimethyl-4-nitroaniline Units in Novel ˇ°Parallel Connectionˇ± Chromophores on Its Nonlinear Optical Properties %A Chao-Zhi Zhang %A Hui Cao %A Zhao-Bing Guo %J ISRN Physical Chemistry %D 2012 %I Hindawi Publishing Corporation %R 10.5402/2012/262563 %U http://dx.doi.org/10.5402/2012/262563