J. Konieczkowska, A. Kozanecka-Szmigiel, W. Piecek, R. Węgłowski, and E. Schab-Balcerzak, “Azopolyimides – influence of chemical structure on azochromophore photo-orientation efficiency”, p, vol. 63, no. 7-8, pp. 481-487, Jan. 2021.