Idris, Mochammad. “A Note on Euclidean Spaces $\mathbb{R}^n$ and $n$-Normed Spaces”. Hilbert Journal of Mathematical Analysis 1, no. 2 (May 5, 2023): 65–76. Accessed October 13, 2025. https://hilbertjma.org/hilbertjma/article/view/9.