@article{JIS_2011__14_4_a4,
     author = {Langley, Thomas and Liese, Jeffrey and Remmel, Jeffrey},
     title = {Generating functions for {Wilf} equivalence under generalized factor order},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {14},
     number = {4},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2011__14_4_a4/}
}