- Jimeng Xiao, Casey Tompkins. On Forbidden Poset Problems in the Linear Lattice. Electr. J. Comb., 27(1), 2020.
- John Bamberg, Stephen P. Glasby, Scott Harper, Cheryl E. Praeger. Permutations with Orders Coprime to a Given Integer. Electr. J. Comb., 27(1), 2020.
- Fuliang Lu, Xing Feng, Yan Wang. $b$-Invariant Edges in Essentially 4-Edge-Connected Near-Bipartite Cubic Bricks. Electr. J. Comb., 27(1), 2020.
- Robert A. Krueger. Generalized Ramsey Numbers: Forbidding Paths with Few Colors. Electr. J. Comb., 27(1), 2020.
- Hailun Zheng. Ear Decomposition and Balanced Neighborly Simplicial Manifolds. Electr. J. Comb., 27(1), 2020.
- F. Michel Dekking, Jeffrey Shallit, Neil J. A. Sloane. Queens in Exile: Non-attacking Queens on Infinite Chess Boards. Electr. J. Comb., 27(1), 2020.
- Robert Brijder, Lorenzo Traldi. A Characterization of Circle Graphs in Terms of Multimatroid Representations. Electr. J. Comb., 27(1), 2020.
- Samuel Braunfeld, Pierre Simon. The Classification of Homogeneous Finite-Dimensional Permutation Structures. Electr. J. Comb., 27(1), 2020.
- Luis Fredes, Avelio Sepúlveda. Tree-Decorated Planar Maps. Electr. J. Comb., 27(1), 2020.
- Vladislav V. Kabanov, Elena V. Konstantinova, Leonid Shalaginov, Alexandr Valyuzhenich. Minimum Supports of Eigenfunctions with the Second Largest Eigenvalue of the Star Graph. Electr. J. Comb., 27(2), 2020.