no. 4
Ogden's lemma for nonterminal bounded languages
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 4, pp. 457-471. 
@article{ITA_1986__20_4_457_0,
     author = {Boonyavatana, R. and Slutzki, G.},
     title = {Ogden's lemma for nonterminal bounded languages},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {457--471},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {20},
     number = {4},
     year = {1986},
     zbl = {0631.68065},
     mrnumber = {880847},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1986__20_4_457_0/}
}
TY  - JOUR
AU  - Boonyavatana, R.
AU  - Slutzki, G.
TI  - Ogden's lemma for nonterminal bounded languages
JO  - RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
PY  - 1986
DA  - 1986///
SP  - 457
EP  - 471
VL  - 20
IS  - 4
PB  - AFCET - Gauthier-Villars
PP  - Paris
UR  - http://www.numdam.org/item/ITA_1986__20_4_457_0/
UR  - https://zbmath.org/?q=an%3A0631.68065
UR  - https://www.ams.org/mathscinet-getitem?mr=880847
LA  - en
ID  - ITA_1986__20_4_457_0
ER  - 
Boonyavatana, R.; Slutzki, G. Ogden's lemma for nonterminal bounded languages. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 4, pp. 457-471. http://www.numdam.org/item/ITA_1986__20_4_457_0/

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