Gunderson, Karen. “Minimum Degree Conditions for Small Percolating Sets in Bootstrap Percolation”. The Electronic Journal of Combinatorics 27, no. 2 (May 29, 2020): P2.37. Accessed March 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v27i2p37.