@article{10_37236_8700,
     author = {Robert Brignall and Jakub Slia\v{c}an},
     title = {Combinatorial specifications for juxtapositions of permutation classes},
     journal = {The electronic journal of combinatorics},
     year = {2019},
     volume = {26},
     number = {4},
     doi = {10.37236/8700},
     zbl = {1422.05002},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/8700/}
}