no. 2
One counter languages and the chevron operation
RAIRO. Informatique théorique, Tome 13 (1979) no. 2, pp. 189-194 
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     publisher = {EDP Sciences},
     volume = {13},
     number = {2},
     mrnumber = {543940},
     zbl = {0441.68081},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1979__13_2_189_0/}
}
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Greibach, S. A. One counter languages and the chevron operation. RAIRO. Informatique théorique, Tome 13 (1979) no. 2, pp. 189-194. https://www.numdam.org/item/ITA_1979__13_2_189_0/

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