Komatsu, T., et al. “A $(p,q)$ Analogue of Poly-Euler Polynomials and Some Related Polynomials”. Ukrains’kyi Matematychnyi Zhurnal, vol. 72, no. 4, Mar. 2020, pp. 467-82, https://doi.org/10.37863/umzh.v72i4.6048.