R. Gray, J. D. Mitchell. Largest subsemigroups of the full transformation monoid. Discrete Mathematics, 308(20):4801-4810, 2008. [doi]
@article{GrayM08,
title = {Largest subsemigroups of the full transformation monoid},
author = {R. Gray and J. D. Mitchell},
year = {2008},
doi = {10.1016/j.disc.2007.08.075},
url = {http://dx.doi.org/10.1016/j.disc.2007.08.075},
tags = {transformation},
researchr = {https://researchr.org/publication/GrayM08},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {308},
number = {20},
pages = {4801-4810},
}