Sekkat, Z., Pretre, P., Knoesen, A., Volksen, W., Lee, V. Y., Miller, R. D., et al. (1998). Correlation between polymer architecture and sub-glass-transition-temperature light-induced molecular movement in azo-polyimide polymers: influence on linear and second- and third-order nonlinear optical processes. Journal of the Optical Society of America B, 15, 401-413.