Srivastava, H. M., et al. “A Class of Fractional Integral Operators Involving a Certain General Multiindex Mittag-Leffler Function ”. Ukrains’kyi Matematychnyi Zhurnal, vol. 75, no. 8, Aug. 2023, pp. 1096-12, https://doi.org/10.3842/umzh.v75i8.863.