no. 4
Some theorems on graph congruences
RAIRO. Informatique théorique, Tome 17 (1983) no. 4, pp. 331-342. 
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     author = {Knast, Robert},
     title = {Some theorems on graph congruences},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {331--342},
     publisher = {EDP-Sciences},
     volume = {17},
     number = {4},
     year = {1983},
     mrnumber = {743893},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1983__17_4_331_0/}
}
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Knast, Robert. Some theorems on graph congruences. RAIRO. Informatique théorique, Tome 17 (1983) no. 4, pp. 331-342. http://www.numdam.org/item/ITA_1983__17_4_331_0/

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3. R. Knast, A Semigroup Characterization of Dot-Depth One Languages R.A.I.R.O., Informatique théorique, Vol. 17, No. 4, 1983, pp. 321-330. | Numdam | MR | Zbl

4. I. Simon, Piecewise Testable Events {2nd GI-Professional Conference on Automata Theory and Formal Languages, L.N. in Computer Science, Vol. 33, 1975, Springer Verlag, pp. 214-222). | MR | Zbl