Gąsior, Anna, and Andrzej Szczepański. “Examples of Non Connective C*-Algebras”. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica 20 (July 20, 2021): 57–61. Accessed April 3, 2025. https://studmath.uken.krakow.pl/article/view/8491.