Dimitrov, Rumen. 2009. “Extensions of Certain Partial Automorphisms of $\mathcal{L}^{\mathcal{ \ast }}(V_{\infty })$”. Ann. Sofia Univ. Fac. Math. And Inf. 99 (December):183-91. https://annual.uni-sofia.bg/index.php/fmi/article/view/121.