no. 1
Constructing the maximal monoids in the semigroups 𝒩 n ,𝒮 n , and Ω n
Compositio Mathematica, Tome 32 (1976) no. 1, pp. 41-52. 
@article{CM_1976__32_1_41_0,
     author = {Hartfiel, D. J. and Maxson, C. J.},
     title = {Constructing the maximal monoids in the semigroups $\mathcal {N}_n, \mathcal {S}_n$, and $\Omega _n$},
     journal = {Compositio Mathematica},
     pages = {41--52},
     publisher = {Noordhoff International Publishing},
     volume = {32},
     number = {1},
     year = {1976},
     zbl = {0326.20060},
     language = {en},
     url = {http://www.numdam.org/item/CM_1976__32_1_41_0/}
}
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Hartfiel, D. J.; Maxson, C. J. Constructing the maximal monoids in the semigroups $\mathcal {N}_n, \mathcal {S}_n$, and $\Omega _n$. Compositio Mathematica, Tome 32 (1976) no. 1, pp. 41-52. http://www.numdam.org/item/CM_1976__32_1_41_0/

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