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APA Citation
Franckevičius, M., Mishra, A., Kreuzer, F., Luo, J., Zakeeruddin, S. M., & Grätzel, M. (n.d.). a dopant-free spirobi[cyclopenta[2, 1-b:3, 4-b′]dithiophene] based hole-transport material for efficient perovskite solar cells. Materials horizons, 2(6), 613–618. http://access.bl.uk/ark:/81055/vdc_100029724489.0x000002