no. 1
Indexed counter languages
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 26 (1992) no. 1, pp. 93-113. 
@article{ITA_1992__26_1_93_0,
     author = {Duske, J. and Middendorf, M. and Parchmann, R.},
     title = {Indexed counter languages},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {93--113},
     publisher = {EDP-Sciences},
     volume = {26},
     number = {1},
     year = {1992},
     mrnumber = {1155346},
     zbl = {0803.68063},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1992__26_1_93_0/}
}
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Duske, J.; Middendorf, M.; Parchmann, R. Indexed counter languages. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 26 (1992) no. 1, pp. 93-113. http://archive.numdam.org/item/ITA_1992__26_1_93_0/

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