Jorge Almeida, Stuart W. Margolis, Mikhail V. Volkov. The pseudovariety of semigroups of triangular matrices over a finite field. ITA, 39(1):31-48, 2005. [doi]
@article{AlmeidaMV05,
title = {The pseudovariety of semigroups of triangular matrices over a finite field},
author = {Jorge Almeida and Stuart W. Margolis and Mikhail V. Volkov},
year = {2005},
doi = {10.1051/ita:2005002},
url = {http://dx.doi.org/10.1051/ita:2005002},
researchr = {https://researchr.org/publication/AlmeidaMV05},
cites = {0},
citedby = {0},
journal = {ITA},
volume = {39},
number = {1},
pages = {31-48},
}