Navruzovich, Y. P. ., and D. . Ortiqboyev. “Shadow of the Kerr–Newman–Kiselev–Letelier Black Hole”. Vital Annex: International Journal of Novel Research in Advanced Sciences, vol. 2, no. 9, Sept. 2023, pp. 16-23, https://innosci.org/IJNRAS/article/view/1621.