Dimitrov, Rumen. “Extensions of Certain Partial Automorphisms of $\mathcal{L}^{\mathcal{ \ast }}(V_{\infty })$”. Ann. Sofia Univ. Fac. Math. and Inf. 99 (December 12, 2009): 183–191. Accessed January 15, 2025. https://admin.uni-sofia.bg/index.php/fmi/article/view/121.