no. 1
The structure of index sets and reduced indexed grammars
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 24 (1990) no. 1, pp. 89-104. 
@article{ITA_1990__24_1_89_0,
     author = {Parchmann, R. and Duske, J.},
     title = {The structure of index sets and reduced indexed grammars},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {89--104},
     publisher = {EDP-Sciences},
     volume = {24},
     number = {1},
     year = {1990},
     mrnumber = {1060468},
     zbl = {0701.68071},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1990__24_1_89_0/}
}
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Parchmann, R.; Duske, J. The structure of index sets and reduced indexed grammars. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 24 (1990) no. 1, pp. 89-104. http://archive.numdam.org/item/ITA_1990__24_1_89_0/

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