no. 2
Graph congruences and pair testing
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 2, pp. 129-147. 
@article{ITA_1986__20_2_129_0,
     author = {Brzozowski, J. A. and Knast, Robert},
     title = {Graph congruences and pair testing},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {129--147},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {20},
     number = {2},
     year = {1986},
     mrnumber = {860765},
     zbl = {0597.20050},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1986__20_2_129_0/}
}
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AU  - Knast, Robert
TI  - Graph congruences and pair testing
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PY  - 1986
SP  - 129
EP  - 147
VL  - 20
IS  - 2
PB  - AFCET - Gauthier-Villars
PP  - Paris
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%D 1986
%P 129-147
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%I AFCET - Gauthier-Villars
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%U http://archive.numdam.org/item/ITA_1986__20_2_129_0/
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Brzozowski, J. A.; Knast, Robert. Graph congruences and pair testing. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 2, pp. 129-147. http://archive.numdam.org/item/ITA_1986__20_2_129_0/

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3. S. Eilenberg, Automata, Languages and Machines, Vol. B, Academic Press, New York 1976. | MR | Zbl

4. R. Knast, Bilocally Testable Languages, Bulletin of the Polish, Academy of Sciences (Mathematics), Vol. 31, No. 5-8, 1983. pp. 313-320. | MR | Zbl