no. 3
The local and global varieties induced by nilpotent monoids
RAIRO. Informatique théorique et applications, Tome 20 (1986) no. 3, pp. 339-355 
@article{ITA_1986__20_3_339_0,
     author = {Weiss, Alex},
     title = {The local and global varieties induced by nilpotent monoids},
     journal = {RAIRO. Informatique th\'eorique et applications},
     pages = {339--355},
     year = {1986},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {20},
     number = {3},
     mrnumber = {894718},
     zbl = {0607.20035},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1986__20_3_339_0/}
}
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Weiss, Alex. The local and global varieties induced by nilpotent monoids. RAIRO. Informatique théorique et applications, Tome 20 (1986) no. 3, pp. 339-355. https://www.numdam.org/item/ITA_1986__20_3_339_0/

[S] H. Straubing, The Variety Generated by Finite Nilpotent Monoids, Semigroup Forum, Vol. 24, 1982, pp. 25-38. | Zbl | MR

[T & W] D. Thérien and A. Weiss, Graph Congruences and Wreath Products, J. P. Ap. Alg., Vol. 36, 1985, pp. 205-215. | Zbl | MR

[W & T] A. Weiss and D. Thérien, Varieties of Finite Categories, R.A.I.R.O. Informatique Théorique, Vol. 20, n° 3, 1986, pp. 357-366. | Zbl | MR | Numdam