Lapidus, Michael L. “Analysis on Fractals, Laplacians on Self-Similar Sets, Noncommutative Geometry and Spectral Dimensions”. Topological Methods in Nonlinear Analysis 4, no. 1 (September 1, 1994): 137–195. Accessed March 28, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.1994.025.