A. V. Zagorodnyuk and T. V. Vasylyshyn, “Polarization formula for $(p,q)$-polynomials on a complex normed space”, MFAT, vol. 17, no. 1, pp. 75–83, Mar. 2011, Accessed: Dec. 16, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/472