Vasylyshyn, T.V., and A.V. Zagorodnyuk. “Polarization Formula and Polarization Inequality for $(p,q)$-Linear Maps”. Carpathian Mathematical Publications 1, no. 2 (December 30, 2009): 128–144. Accessed April 19, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/4008.