no. 2
One counter languages and the chevron operation
RAIRO. Informatique théorique, Tome 13 (1979) no. 2, pp. 189-194. 
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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. http://www.numdam.org/item/ITA_1979__13_2_189_0/

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