Graff, Grzegorz, Jacek Gulgowski, and Małgorzata Lebiedź. “Generalized Dold Sequences on Partially-Ordered Sets”. The Electronic Journal of Combinatorics 29, no. 1 (February 11, 2022): P1.25. Accessed March 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v29i1p25.