@article{10_37236_3345,
     author = {R. P. Anstee and Linyuan Lu},
     title = {Repeated columns and an old chestnut},
     journal = {The electronic journal of combinatorics},
     year = {2013},
     volume = {20},
     number = {4},
     doi = {10.37236/3345},
     zbl = {1298.05310},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/3345/}
}