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APA Citation
Ighina, L., Caccianiga, A., Moretti, A., Belladitta, S., Della Ceca, R., Ballo, L., & Dallacasa, D. (2019). x-ray properties of z > 4 blazars. Monthly notices of the Royal Astronomical Society, 489(2), 2732–2745. http://access.bl.uk/ark:/81055/vdc_100095509686.0x000057