@article{10_37236_9734,
     author = {Andrzej Dudek and Jaros{\l}aw Grytczuk and Andrzej Ruci\'nski},
     title = {Variations on twins in permutations},
     journal = {The electronic journal of combinatorics},
     year = {2021},
     volume = {28},
     number = {3},
     doi = {10.37236/9734},
     zbl = {1470.05009},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/9734/}
}