Emtander, E., R. Fröberg, F. Mohammadi, and S. Moradi. “Poincaré Series of Some Hypergraph Algebras”. MATHEMATICA SCANDINAVICA 112, no. 1 (March 1, 2013): 5–10. Accessed April 6, 2025. https://www.mscand.dk/article/view/15229.