Hilmarsson, Ísak, Jónsdóttir, I., Sigurðardóttir, S., Viðarsdóttir, L., & Ulfarsson, H. (2015). Wilf-Classification of Mesh Patterns of Short Length. The Electronic Journal of Combinatorics, 22(4), P4.13. https://doi.org/10.37236/4678