Meier Carlsen, Toke, and Kengo Matsumoto. “Some Remarks on the $C^*$-Algebras Associated With Subshifts”. Mathematica Scandinavica 95, no. 1 (September 1, 2004): 145–160. Accessed July 24, 2026. https://journals.msp.org/mscand/article/view/766.