Anevska, Risto Malčeski, Katerina, and Samoil Malčeski. “SOME CHARACTERIZATIONS OF 2-INNER PRODUCT”,. Matematichki Bilten 41, no. 2 (January 1, 2017). Accessed June 13, 2026. https://bilten.smm.org.mk/index.php/bilten/article/view/1848.