no. 3
On languages satisfying Ogden's lemma
RAIRO. Informatique théorique, Tome 12 (1978) no. 3, pp. 201-202. 
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     title = {On languages satisfying {Ogden's} lemma},
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     pages = {201--202},
     publisher = {EDP-Sciences},
     volume = {12},
     number = {3},
     year = {1978},
     mrnumber = {510637},
     zbl = {0387.68054},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1978__12_3_201_0/}
}
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Boasson, L.; Horváth, S. On languages satisfying Ogden's lemma. RAIRO. Informatique théorique, Tome 12 (1978) no. 3, pp. 201-202. http://archive.numdam.org/item/ITA_1978__12_3_201_0/

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