W. M. B. Dukes, Toufik Mansour, Astrid Reifegerste. Wilf classification of three and four letter signed patterns. Discrete Mathematics, 308(15):3125-3133, 2008. [doi]
@article{DukesMR08,
title = {Wilf classification of three and four letter signed patterns},
author = {W. M. B. Dukes and Toufik Mansour and Astrid Reifegerste},
year = {2008},
doi = {10.1016/j.disc.2007.06.013},
url = {http://dx.doi.org/10.1016/j.disc.2007.06.013},
tags = {classification},
researchr = {https://researchr.org/publication/DukesMR08},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {308},
number = {15},
pages = {3125-3133},
}